hasMany foreignKey reset when using saveAll()

Hello,

I have a hasMany relation with the tables "documents" and
"documents_datas". When I update the form containing all related data
to the document all changes are stored correctly, apart the foreignKey
'document_id'. In the debugger the value for document_id is empty,
when saved.
Strange is, that when I check the value of the hidden form element in
the HTML code, the 'document_id' is present.

Why does it get lost when saving?

Models are:

<?php
class Document extends AppModel
{
var $name = 'Document';
var $hasMany = array(
'DocumentsData' => array(
'className' => 'DocumentsData',
'foreignKey' => 'document_id'
)

);
?>

and

<?php
class DocumentsData extends AppModel
{
var $name = 'DocumentsData';
var $belongsTo = 'Document';

}
?>

Thanks for any help.
Aldo
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