Undefined id and don´t know why....

Hi cakers,

i have a problem by using this code:

  
if(!empty($this->data)) {
 
				$product = $this->Product->save($this->data);
   
				if(!empty($product)) {
   
					$this->loadModel('Kattaxonomie');
   
					$counted_katId = count($this->data['Kat']);
   
					for($i=0;$i<$counted_katId;$i++) {
   
						$this->Kattaxonomie->set(array(
   
							'product_id' => $this->Product->id,
   
							'kat_id' => $this->data['Kat']['kat_id'][$i]
   
						));
 
						$this->Kattaxonomie->save();
 
					}
 
					$this->redirect(array('action'=>'list_products'));
   
				}
 
			}

i got always undefined id why i set my primery_key to product_id and not only id.

And this is the ouput from cakePHP:

Notice (8): Undefined index:  id [CORE/cake/libs/model/model.php, line 1325]
  Code | Context
$this	=	AppModel AppModel::$useDbConfig = "default" AppModel::$useTable = "kattaxonomies" AppModel::$displayField = false AppModel::$id = false AppModel::$data = array AppModel::$table = "kattaxonomies" AppModel::$primaryKey = "id" AppModel::$_schema = array AppModel::$validate = array AppModel::$validationErrors = array AppModel::$tablePrefix = "wf_" AppModel::$name = "Kattaxonomie" AppModel::$alias = "Kattaxonomie" AppModel::$tableToModel = array AppModel::$logTransactions = false AppModel::$cacheQueries = false AppModel::$belongsTo = array AppModel::$hasOne = array AppModel::$hasMany = array AppModel::$hasAndBelongsToMany = array AppModel::$actsAs = NULL AppModel::$Behaviors = BehaviorCollection object AppModel::$whitelist = array AppModel::$cacheSources = true AppModel::$findQueryType = NULL AppModel::$recursive = 1 AppModel::$order = NULL AppModel::$virtualFields = array AppModel::$__associationKeys = array AppModel::$__associations = array AppModel::$__backAssociation = array AppModel::$__insertID = NULL AppModel::$__numRows = NULL AppModel::$__affectedRows = NULL AppModel::$_findMethods = array $data	=	null $validate	=	true $fieldList	=	array() $defaults	=	array( 	"validate" => true, 	"fieldList" => array(), 	"callbacks" => true ) $_whitelist	=	array() $fields	=	array( 	"product_id", 	"kat_id" ) $options	=	array( 	"validate" => true, 	"fieldList" => array(), 	"callbacks" => true ) $field	=	"modified" $keyPresentAndEmpty	=	false $exists	=	false $dateFields	=	array( 	"modified", 	"updated", 	"created" ) $db	=	DboMysql DboMysql::$description = "MySQL DBO Driver" DboMysql::$_baseConfig = array DboMysql::$startQuote = "`" DboMysql::$endQuote = "`" DboMysql::$_useAlias = true DboMysql::$_commands = array DboMysql::$fieldParameters = array DboMysql::$tableParameters = array DboMysql::$columns = array DboMysql::$index = array DboMysql::$alias = "AS " DboMysql::$methodCache = array DboMysql::$cacheMethods = true DboMysql::$__bypass = true DboMysql::$__sqlOps = array DboMysql::$virtualFieldSeparator = "__" DboMysql::$connected = true DboMysql::$fullDebug = true DboMysql::$error = NULL DboMysql::$affected = 3 DboMysql::$numRows = 3 DboMysql::$took = 1 DboMysql::$_result = resource DboMysql::$_queriesCnt = 9 DboMysql::$_queriesTime = 4 DboMysql::$_queriesLog = array DboMysql::$_queriesLogMax = 200 DboMysql::$_queryCache = array DboMysql::$__descriptions = array DboMysql::$_sources = array DboMysql::$connection = resource DboMysql::$config = array DboMysql::$configKeyName = "default" DboMysql::$_transactionStarted = false DboMysql::$cacheSources = true DboMysql::$results = resource DboMysql::$map = array DboMysql::$__booleans = array $updateCol	=	"created" $result	=	true $values	=	array( 	"18", 	"1" ) $v	=	array( 	"product_id" => "18", 	"kat_id" => "1" ) $n	=	"Kattaxonomie" $y	=	"1" $x	=	"kat_id" $count	=	2 $success	=	true $created	=	false $cache	=	array()

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