[TYPO3-english] Extbase: selectMultipleSideBySide allow item mutiple times

[Stephan Bauer]

Hello,

I need a selectMultipleSideBySide that allows an item multiple times.
I added the option 'multiple' => 1 and extended the mm table with the 
field uid like descripted here:
https://docs.typo3.org/typo3cms/TCAReference/ColumnsConfig/Type/Select.html#id103

In the backend everything works but if I'm fetching the object in the 
controller I'm only getting every item once. The duplicate entries are 
deleted.

Is there a way to solve this.

Thanks in advance

Regards
Stephan