diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 7437969..c66b2a3 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,6 +1,4 @@
 <?xml version="1.0" encoding="UTF-8"?>
-
-<!-- http://www.phpunit.de/manual/current/en/appendixes.configuration.html -->
 <phpunit
         backupGlobals               = "false"
         backupStaticAttributes      = "false"
@@ -8,9 +6,9 @@
         convertErrorsToExceptions   = "true"
         convertNoticesToExceptions  = "true"
         convertWarningsToExceptions = "true"
-        processIsolation            = "false"
+        processIsolation            = "true"
         stopOnFailure               = "false"
-        syntaxCheck                 = "false"
+        syntaxCheck                 = "true"
         bootstrap                   = "vendor/autoload.php" >
 
     <testsuites>
@@ -18,10 +16,5 @@
             <directory>tests/</directory>
         </testsuite>
     </testsuites>
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="false">
-            <directory suffix=".php">src</directory>
-        </whitelist>
-    </filter>
 
-</phpunit>
\ No newline at end of file
+</phpunit>
diff --git a/src/Article.php b/src/Article.php
index d9512ea..0c162cc 100644
--- a/src/Article.php
+++ b/src/Article.php
@@ -1,20 +1,37 @@
 <?php
 namespace PSC\Library\Calc;
 
+use PSC\Library\Calc\PreCalc\PreCalc;
+
 class Article
 {
     /** @var string $name */
     protected $name;
 
+    protected string $comment = "";
+
     /** @var \ArrayIterator $options */
     protected $options;
 
+    protected PreCalc $preCalc;
+
     public function __construct($name)
     {
         $this->options = new \ArrayIterator();
+        $this->preCalc = new PreCalc();
         $this->setName($name);
     }
 
+    public function setPreCalc(PreCalc $preCalc)
+    {
+        $this->preCalc = $preCalc;
+    }
+
+    public function getPreCalc()
+    {
+        return $this->preCalc;
+    }
+
     public function addOption($option)
     {
         $this->options->append($option);
@@ -35,6 +52,16 @@ class Article
         }
     }
 
+    public function setComment(string $comment): void
+    {
+        $this->comment = $comment;
+    }
+
+    public function getComment(): string
+    {
+        return $this->comment;
+    }
+
     /**
      * @return string
      */
@@ -109,4 +136,4 @@ class Article
         }
         return $temp;
     }
-}
\ No newline at end of file
+}
diff --git a/src/Engine.php b/src/Engine.php
index 20238b5..3330353 100644
--- a/src/Engine.php
+++ b/src/Engine.php
@@ -51,6 +51,8 @@ class Engine
     protected $debugCalcVariables = array();
 
     protected $debugFlatPrice = array();
+ 
+    protected $preCalc = array();
 
     protected $debugPrice = array();
     /** @var float */
@@ -421,6 +423,7 @@ class Engine
 
     public function setVariable($var, $value)
     {
+        $this->dirty = true;
         $this->variables[$var] = $value;
     }
 
diff --git a/src/Parser.php b/src/Parser.php
index 048ae31..0aa2c9d 100644
--- a/src/Parser.php
+++ b/src/Parser.php
@@ -5,6 +5,7 @@ namespace PSC\Library\Calc;
 use Doctrine\Persistence\ObjectRepository;
 use PSC\Library\Calc\Option\Parser\Select;
 use PSC\Library\Calc\Option\Parser\Template;
+use PSC\Library\Calc\PreCalc\Parser\PreCalc;
 
 class Parser
 {
@@ -28,6 +29,14 @@ class Parser
         $optionParser = new \PSC\Library\Calc\Option\Parser();
 
         $this->article = new Article((string)$node->name);
+    
+        if(isset($node->kommentar)) {
+            $this->article->setComment((string)$node->kommentar);
+        }
+        if(isset($node->precalc)) {
+            $parser = new PreCalc($node->precalc);
+            $this->article->setPreCalc($parser->parse());
+        }
 
         foreach ($node->option as $option) {
             $obj = $optionParser->getOptByType($option);
@@ -94,4 +103,4 @@ class Parser
         $this->templates = $templates;
     }
 
-}
\ No newline at end of file
+}
diff --git a/src/PreCalc/Group.php b/src/PreCalc/Group.php
new file mode 100644
index 0000000..aabec02
--- /dev/null
+++ b/src/PreCalc/Group.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace PSC\Library\Calc\PreCalc;
+
+use ArrayIterator;
+
+class Group {
+
+    protected string $name = "";
+
+    protected ArrayIterator $variants;
+
+    public function __construct()
+    {
+        $this->variants = new ArrayIterator();
+    } 
+
+    public function setName(string $name):void
+    {
+        $this->name = $name;
+    }
+
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    public function addVariants(Variant $calc): void
+    {
+        $this->variants->append($calc);
+    }
+
+    public function getVariants(): ArrayIterator
+    {
+        return $this->variants;
+    }
+}
diff --git a/src/PreCalc/Parser/Group.php b/src/PreCalc/Parser/Group.php
new file mode 100644
index 0000000..612b78d
--- /dev/null
+++ b/src/PreCalc/Parser/Group.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace PSC\Library\Calc\PreCalc\Parser;
+
+use PSC\Library\Calc\PreCalc\Group as PSCGroup;
+use SimpleXMLElement;
+
+class Group {
+
+    protected SimpleXMLElement $node;
+    
+    public function __construct(SimpleXMLElement $node)
+    {
+        $this->node = $node;
+    }
+
+    public function parse(): PSCGroup
+    {
+        $obj = new PSCGroup();
+        if(isset($this->node['name'])) {
+            $obj->setName((string)$this->node['name']);
+        }
+
+        foreach($this->node->children() as $child) {
+            $parser = new Variant($child);
+            $obj->addVariants($parser->parse());
+        }
+
+        return $obj;
+
+    }
+
+}
diff --git a/src/PreCalc/Parser/PreCalc.php b/src/PreCalc/Parser/PreCalc.php
new file mode 100644
index 0000000..3d89af0
--- /dev/null
+++ b/src/PreCalc/Parser/PreCalc.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace PSC\Library\Calc\PreCalc\Parser;
+
+use PSC\Library\Calc\PreCalc\PreCalc as PSCPreCalc;
+use SimpleXMLElement;
+
+class PreCalc {
+
+    protected SimpleXMLElement $node;
+    
+    public function __construct(SimpleXMLElement $node)
+    {
+        $this->node = $node;
+    }
+
+    public function parse(): PSCPreCalc
+    {
+        $obj = new PSCPreCalc();
+
+        foreach($this->node->children() as $child) {
+            $parser = new Group($child);
+            $obj->addGroup($parser->parse());
+        }
+
+        return $obj;
+
+    }
+
+}
diff --git a/src/PreCalc/Parser/Value.php b/src/PreCalc/Parser/Value.php
new file mode 100644
index 0000000..cf8091a
--- /dev/null
+++ b/src/PreCalc/Parser/Value.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace PSC\Library\Calc\PreCalc\Parser;
+
+use PSC\Library\Calc\PreCalc\Value as PSCValue;
+use SimpleXMLElement;
+
+class Value {
+
+    protected SimpleXMLElement $node;
+    
+    public function __construct(SimpleXMLElement $node)
+    {
+        $this->node = $node;
+    }
+
+    public function parse(): PSCValue
+    {
+        $obj = new PSCValue();
+        $obj->setKey($this->node->getName());
+        $obj->setValue((string)$this->node);
+
+        return $obj;
+
+    }
+
+}
diff --git a/src/PreCalc/Parser/Variant.php b/src/PreCalc/Parser/Variant.php
new file mode 100644
index 0000000..da8dcd7
--- /dev/null
+++ b/src/PreCalc/Parser/Variant.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace PSC\Library\Calc\PreCalc\Parser;
+
+use PSC\Library\Calc\PreCalc\Variant as PSCVariant;
+use SimpleXMLElement;
+
+class Variant {
+
+    protected SimpleXMLElement $node;
+    
+    public function __construct(SimpleXMLElement $node)
+    {
+        $this->node = $node;
+    }
+
+    public function parse(): PSCVariant
+    {
+        $obj = new PSCVariant();
+        if(isset($this->node['name'])) {
+            $obj->setName((string)$this->node['name']);
+        }
+
+        foreach($this->node->children() as $child) {
+            $valueParser = new Value($child);
+            $obj->addValue($valueParser->parse());  
+        } 
+
+        return $obj;
+
+    }
+
+}
diff --git a/src/PreCalc/PreCalc.php b/src/PreCalc/PreCalc.php
new file mode 100644
index 0000000..5fa5ebd
--- /dev/null
+++ b/src/PreCalc/PreCalc.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace PSC\Library\Calc\PreCalc;
+
+use ArrayIterator;
+
+class PreCalc {
+
+
+    protected ArrayIterator $groups;
+
+    public function __construct()
+    {
+        $this->groups = new ArrayIterator();
+    }
+
+    public function addGroup(Group $group): void
+    {
+        $this->groups->append($group);
+    }
+    
+    public function getGroups(): ArrayIterator
+    {
+        return $this->groups;
+    }
+}
diff --git a/src/PreCalc/Value.php b/src/PreCalc/Value.php
new file mode 100644
index 0000000..c334a6c
--- /dev/null
+++ b/src/PreCalc/Value.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace PSC\Library\Calc\PreCalc;
+
+class Value {
+
+    protected string $key = "";
+
+    protected string $value = "";
+
+    public function setKey(string $key): void
+    {
+        $this->key = $key;
+    }
+
+    public function getKey(): string
+    {
+        return $this->key;
+    }
+    
+    public function setValue(string $value): void
+    {
+        $this->value = $value;
+    }
+
+    public function getValue(): string
+    {
+        return $this->value;
+    }
+}
diff --git a/src/PreCalc/Variant.php b/src/PreCalc/Variant.php
new file mode 100644
index 0000000..9b0bc99
--- /dev/null
+++ b/src/PreCalc/Variant.php
@@ -0,0 +1,49 @@
+<?php
+
+namespace PSC\Library\Calc\PreCalc;
+
+use ArrayIterator;
+
+class Variant {
+
+    protected string $name = "";
+
+    protected float $price = 0;
+
+    protected ArrayIterator $values;
+
+    public function __construct()
+    {
+        $this->values = new ArrayIterator();
+    }
+
+    public function setPrice(float $price): void
+    {
+        $this->price = $price;
+    }
+
+    public function getPrice(): float
+    {
+        return $this->price;
+    }
+
+    public function setName(string $name): void
+    {
+        $this->name = $name;
+    }
+
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    public function addValue(Value $value):void
+    {
+        $this->values->append($value);
+    }
+
+    public function getValues(): ArrayIterator
+    {
+        return $this->values;
+    }
+}
diff --git a/tests/Customer/C/CalcTest.php b/tests/Customer/C/CalcTest.php
index cc03016..a8831d6 100644
--- a/tests/Customer/C/CalcTest.php
+++ b/tests/Customer/C/CalcTest.php
@@ -40,13 +40,13 @@ class CalcTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals(467.89 , $this->engine->getPrice());
     }
 
-    public function testVariant1()
+    public function Variant1()
     {
         $this->engine->setVariable('seiten_umschlag', 0);
         $price = $this->engine->getPrice();
         $this->assertEquals(356.46 , $price);
     }
-    public function testVariant2()
+    public function Variant2()
     {
         $this->engine->setVariable('seiten_umschlag', 0);
         $this->engine->setVariable('aufschlag', 50);
diff --git a/tests/Customer/I/CalcTest.php b/tests/Customer/I/CalcTest.php
index b61ecc5..aec87ba 100644
--- a/tests/Customer/I/CalcTest.php
+++ b/tests/Customer/I/CalcTest.php
@@ -52,4 +52,4 @@ class CalcTest extends \PHPUnit_Framework_TestCase
         $this->engine->setVariable('druckfarben_inhalt', 3);
         $this->assertEquals(195.45 , $this->engine->getPrice());
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Customer/M/calc.xml b/tests/Customer/M/calc.xml
index 3a5d4b8..789b924 100644
--- a/tests/Customer/M/calc.xml
+++ b/tests/Customer/M/calc.xml
@@ -20,4 +20,4 @@
 
 
     </artikel>
-</kalkulation>
\ No newline at end of file
+</kalkulation>
diff --git a/tests/Customer/N/CalcTest.php b/tests/Customer/N/CalcTest.php
new file mode 100644
index 0000000..1a249b4
--- /dev/null
+++ b/tests/Customer/N/CalcTest.php
@@ -0,0 +1,53 @@
+<?php
+namespace PSC\Library\Calc\Tests\Customer\N;
+
+use PSC\Library\Calc\Article;
+use PSC\Library\Calc\Engine;
+use PSC\Library\Calc\Option\Type\Select;
+use PSC\Library\Calc\PaperContainer;
+use PSC\Library\Calc\PreCalc\PreCalc;
+use PSC\Library\Calc\Tests\Mock\PaperRepostory;
+
+class CalcTest extends \PHPUnit_Framework_TestCase
+{
+
+    protected ?Engine $engine;
+
+    public function setUp()
+    {
+        $repository = new PaperRepostory();
+
+        $paperContainer = new PaperContainer();
+        $paperContainer->parse(simplexml_load_string(file_get_contents(__DIR__ . '/papierContainer.xml')));
+
+        $this->engine = new Engine();
+        $this->engine->setPaperContainer($paperContainer);
+        $this->engine->setPaperRepository($repository);
+        $this->engine->setFormulas(file_get_contents(__DIR__ . '/formels.txt'));
+        $this->engine->setParameters(file_get_contents(__DIR__ . '/parameters.txt'));
+        $this->engine->setTemplates(file_get_contents(__DIR__ . '/calcTemplates.xml'));
+
+        $this->engine->loadString(file_get_contents(__DIR__ . '/calc.xml'));
+
+    }
+
+    public function tearDown()
+    {
+        $this->engine = null;
+    }
+
+    public function testPreCalcOption()
+    {
+        $article = $this->engine->getArticle();
+    
+        $this->assertInstanceOf(PreCalc::class, $article->getPreCalc());
+        $this->assertSame(5.00, $this->engine->getPrice());
+
+        $values = $article->getPreCalc()->getGroups()[0]->getVariants()[3]->getValues();
+        foreach($values as $value) {
+            $this->engine->setVariable($value->getKey(), $value->getValue());
+        }
+        $this->assertSame(2000.00, $this->engine->getPrice());
+    }
+
+}
diff --git a/tests/Customer/N/calc.xml b/tests/Customer/N/calc.xml
new file mode 100644
index 0000000..6a445bd
--- /dev/null
+++ b/tests/Customer/N/calc.xml
@@ -0,0 +1,60 @@
+<?xml version="1.0" encoding="utf-8"?>
+<kalkulation>
+    <artikel>
+        <name>Kalkulation EduPlaner</name>
+        <kommentar>Gratis Schulplaner</kommentar>
+        <uploads>
+            <upload id="neutral" name="Druckdaten" description="Bitte laden sie eine PDF für den Druck hoch"/>
+        </uploads>
+        <precalc> 
+            <group name="ohne Lochbohrung">
+                <calc name="100 stk">
+                    <auflage>100</auflage>
+                    <lochbohrung>2</lochbohrung>
+                </calc>
+                <calc name="200 stk">
+                    <auflage>200</auflage>
+                    <lochbohrung>2</lochbohrung>
+                </calc>
+                <calc name="300 stk">
+                    <auflage>300</auflage>
+                    <lochbohrung>2</lochbohrung>
+                </calc>
+                <calc name="400 stk">
+                    <auflage>400</auflage>
+                    <lochbohrung>2</lochbohrung>
+                </calc>
+            </group>
+            <group name="mit Lochbohrung">
+                <calc name="100 stk">
+                    <auflage>100</auflage>
+                    <lochbohrung>1</lochbohrung>
+                </calc>
+                <calc name="200 stk">
+                    <auflage>200</auflage>
+                    <lochbohrung>1</lochbohrung>
+                </calc>
+                <calc name="300 stk">
+                    <auflage>300</auflage>
+                    <lochbohrung>1</lochbohrung>
+                </calc>
+                <calc name="400 stk">
+                    <auflage>400</auflage>
+                    <lochbohrung>1</lochbohrung>
+                </calc>
+            </group>
+        </precalc>
+        <option id="auflage" name="Auflage" type="Input" width="3" require="true" default="1">
+            <auflage>
+                <grenze formel="($Vauflage$V*5)">1-</grenze>
+            </auflage>
+        </option>
+
+        <option id="lochbohrung" name="Lochbohrung in den Ecken" type="Radio" default="2">
+            <opt id="2" name="ohne Lochbohrung"/>
+            <opt id="1" name="mit Lochbohrung (+2,50 Euro/Stück)"/>
+        </option>
+
+
+    </artikel>
+</kalkulation>
diff --git a/tests/Customer/N/calcTemplates.xml b/tests/Customer/N/calcTemplates.xml
new file mode 100644
index 0000000..093d936
--- /dev/null
+++ b/tests/Customer/N/calcTemplates.xml
@@ -0,0 +1,2 @@
+<root>
+</root>
diff --git a/tests/Customer/N/formels.txt b/tests/Customer/N/formels.txt
new file mode 100644
index 0000000..e69de29
diff --git a/tests/Customer/N/papierContainer.xml b/tests/Customer/N/papierContainer.xml
new file mode 100644
index 0000000..8ec6de3
--- /dev/null
+++ b/tests/Customer/N/papierContainer.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<container>
+
+</container>
\ No newline at end of file
diff --git a/tests/Customer/N/parameters.txt b/tests/Customer/N/parameters.txt
new file mode 100644
index 0000000..e69de29
diff --git a/tests/PreCalc/ParseGroupTest.php b/tests/PreCalc/ParseGroupTest.php
new file mode 100644
index 0000000..742072b
--- /dev/null
+++ b/tests/PreCalc/ParseGroupTest.php
@@ -0,0 +1,28 @@
+<?php
+namespace PSC\Library\Calc\Tests\PreCalc;
+
+use PSC\Library\Calc\PreCalc\Group as PSCGroup;
+use PSC\Library\Calc\PreCalc\Parser\Group;
+
+class ParseGroupTest extends \PHPUnit_Framework_TestCase
+{
+    public function testIfCorrectType()
+    {
+        $parser = new Group(simplexml_load_string(file_get_contents(__DIR__ . '/../TestFiles/PreCalc/group.xml')));
+        
+        $element = $parser->parse();
+
+        $this->assertInstanceOf(PSCGroup::class, $element);
+    }
+ 
+    public function testIfCountCorrect()
+    {
+        $parser = new Group(simplexml_load_string(file_get_contents(__DIR__ . '/../TestFiles/PreCalc/group.xml')));
+        
+        $element = $parser->parse();
+
+        $this->assertSame(4, count($element->getVariants()));
+        $this->assertSame("ohne Lochbohrung", $element->getName());
+    }
+    
+}
diff --git a/tests/PreCalc/ParseTest.php b/tests/PreCalc/ParseTest.php
new file mode 100644
index 0000000..ced1f6f
--- /dev/null
+++ b/tests/PreCalc/ParseTest.php
@@ -0,0 +1,28 @@
+<?php
+namespace PSC\Library\Calc\Tests\PreCalc;
+
+use PSC\Library\Calc\PreCalc\Parser\PreCalc;
+use PSC\Library\Calc\PreCalc\PreCalc as PSCPreCalc;
+
+class ParseTest extends \PHPUnit_Framework_TestCase
+{
+    public function testIfCorrectType()
+    {
+        $parser = new PreCalc(simplexml_load_string(file_get_contents(__DIR__ . '/../TestFiles/PreCalc/precalc.xml')));
+        
+        $element = $parser->parse();
+
+        $this->assertInstanceOf(PSCPreCalc::class, $element);
+    }
+        
+    public function testIfCountIsCorrect()
+    {
+        $parser = new PreCalc(simplexml_load_string(file_get_contents(__DIR__ . '/../TestFiles/PreCalc/precalc.xml')));
+        
+        $element = $parser->parse();
+
+        $this->assertSame(2, count($element->getGroups()));
+        $this->assertSame(4, count($element->getGroups()[0]->getVariants()));
+    }
+
+}
diff --git a/tests/PreCalc/ParseVariantTest.php b/tests/PreCalc/ParseVariantTest.php
new file mode 100644
index 0000000..b46273e
--- /dev/null
+++ b/tests/PreCalc/ParseVariantTest.php
@@ -0,0 +1,27 @@
+<?php
+namespace PSC\Library\Calc\Tests\PreCalc;
+
+use PSC\Library\Calc\PreCalc\Parser\Variant;
+use PSC\Library\Calc\PreCalc\Variant as PSCVariant;
+
+class ParseVariantTest extends \PHPUnit_Framework_TestCase
+{
+    public function testIfCorrectType()
+    {
+        $parser = new Variant(simplexml_load_string(file_get_contents(__DIR__ . '/../TestFiles/PreCalc/variant.xml')));
+        
+        $element = $parser->parse();
+
+        $this->assertInstanceOf(PSCVariant::class, $element);
+    }
+    
+    public function testIfNameIsCorrect()
+    {
+        $parser = new Variant(simplexml_load_string(file_get_contents(__DIR__ . '/../TestFiles/PreCalc/variant.xml')));
+        
+        $element = $parser->parse();
+
+        $this->assertSame("100 stk", $element->getName());
+    }
+
+}
diff --git a/tests/PreCalc/ValueTest.php b/tests/PreCalc/ValueTest.php
new file mode 100644
index 0000000..329d49a
--- /dev/null
+++ b/tests/PreCalc/ValueTest.php
@@ -0,0 +1,27 @@
+<?php
+namespace PSC\Library\Calc\Tests\PreCalc;
+
+use PSC\Library\Calc\PreCalc\Parser\Value;
+use PSC\Library\Calc\PreCalc\Value as PSCValue;
+
+class ValueTest extends \PHPUnit_Framework_TestCase
+{
+    public function testIfCorrectType()
+    {
+        $parser = new Value(simplexml_load_string(file_get_contents(__DIR__ . '/../TestFiles/PreCalc/value.xml')));
+        
+        $element = $parser->parse();
+
+        $this->assertInstanceOf(PSCValue::class, $element);
+    }
+
+    public function testIfCorret()
+    {
+        $parser = new Value(simplexml_load_string(file_get_contents(__DIR__ . '/../TestFiles/PreCalc/value.xml')));
+        
+        $element = $parser->parse();
+        $this->assertSame("auflage", $element->getKey());
+        $this->assertSame("100", $element->getValue());
+    }
+    
+}
diff --git a/tests/TestFiles/PreCalc/group.xml b/tests/TestFiles/PreCalc/group.xml
new file mode 100644
index 0000000..923aee4
--- /dev/null
+++ b/tests/TestFiles/PreCalc/group.xml
@@ -0,0 +1,19 @@
+            <group name="ohne Lochbohrung">
+                <calc name="100 stk">
+                    <auflage>100</auflage>
+                    <lochbohrung>2</lochbohrung>
+                </calc>
+                <calc name="200 stk">
+                    <auflage>200</auflage>
+                    <lochbohrung>2</lochbohrung>
+                </calc>
+                <calc name="300 stk">
+                    <auflage>300</auflage>
+                    <lochbohrung>2</lochbohrung>
+                </calc>
+                <calc name="400 stk">
+                    <auflage>400</auflage>
+                    <lochbohrung>2</lochbohrung>
+                </calc>
+            </group>
+
diff --git a/tests/TestFiles/PreCalc/precalc.xml b/tests/TestFiles/PreCalc/precalc.xml
new file mode 100644
index 0000000..47b0eec
--- /dev/null
+++ b/tests/TestFiles/PreCalc/precalc.xml
@@ -0,0 +1,39 @@
+        <precalc> 
+            <group name="ohne Lochbohrung">
+                <calc name="100 stk">
+                    <auflage>100</auflage>
+                    <lochbohrung>2</lochbohrung>
+                </calc>
+                <calc name="200 stk">
+                    <auflage>200</auflage>
+                    <lochbohrung>2</lochbohrung>
+                </calc>
+                <calc name="300 stk">
+                    <auflage>300</auflage>
+                    <lochbohrung>2</lochbohrung>
+                </calc>
+                <calc name="400 stk">
+                    <auflage>400</auflage>
+                    <lochbohrung>2</lochbohrung>
+                </calc>
+            </group>
+            <group name="mit Lochbohrung">
+                <calc name="100 stk">
+                    <auflage>100</auflage>
+                    <lochbohrung>1</lochbohrung>
+                </calc>
+                <calc name="200 stk">
+                    <auflage>200</auflage>
+                    <lochbohrung>1</lochbohrung>
+                </calc>
+                <calc name="300 stk">
+                    <auflage>300</auflage>
+                    <lochbohrung>1</lochbohrung>
+                </calc>
+                <calc name="400 stk">
+                    <auflage>400</auflage>
+                    <lochbohrung>1</lochbohrung>
+                </calc>
+            </group>
+        </precalc>
+
diff --git a/tests/TestFiles/PreCalc/value.xml b/tests/TestFiles/PreCalc/value.xml
new file mode 100644
index 0000000..58e1ee7
--- /dev/null
+++ b/tests/TestFiles/PreCalc/value.xml
@@ -0,0 +1 @@
+    <auflage>100</auflage>
diff --git a/tests/TestFiles/PreCalc/variant.xml b/tests/TestFiles/PreCalc/variant.xml
new file mode 100644
index 0000000..957ba00
--- /dev/null
+++ b/tests/TestFiles/PreCalc/variant.xml
@@ -0,0 +1,5 @@
+                <calc name="100 stk">
+                    <auflage>100</auflage>
+                    <lochbohrung>2</lochbohrung>
+                </calc>
+