[TYPO3-mvc] Updating property failed if not empty

[J. Weber]

Hi,

within an controller i have this code in an update-method:

     $this->articleRepository->update($article);
     $pM = t3lib_div::makeInstance('Tx_Extbase_Persistence_Manager');
     $pM->persistAll();

all article-properties are correct updated except the "articletype"-object.
Within the controller articletype seems updated, but the field in the 
database is not changed.

	$article->getArticletype()." - ".$this->articleRepository->findByUid( $article->getUid() )->getArticletype()
|	Tx_Wpj_Domain_Model_articletype:100 - Tx_Wpj_Domain_Model_articletype:100|


No errors in the log. This is so strange, i can't believe it...

Regards,
Jens