[TYPO3-mvc] error in TCA: (travel) Probably value mismatch with fieldtype.

[Domi]

I saw that if I would use a MM relation, there is a setup for the 
editing on both sides ("MM_opposite_field"). But isn't that bit 
overloaded, only for supporting the edit on both tables? Actually it is 
a pure n:1 relation of my Aggregat Root.

Cheers
Dominic