[TYPO3-mvc] How to extend and treat Tx_Extbase_Domain_Model_FrontendUserGroup in m:n relation

[Marc Bastian Heinrichs]

Hej,

> I have following simple Extbase Domain Model:
> Project<projectLayers(m:n)>  Layer<frontendUserGroups(m:n)>  FrontendUserGroup
>
> Object FrontendUserGroup is simply extension of Tx_Extbase_Domain_Model_FrontendUserGroup with no additional functionality or fields:
> class Tx_Example_Domain_Model_FrontendUserGroup extends Tx_Extbase_Domain_Model_FrontendUserGroup {
>
> }
 >
 > [...]
 >
 > Can anyone kick me right way please

It should work if you relate layer to 
Tx_Extbase_Domain_Model_FrontendUserGroup and not your own class.

But if you want to use your own class you need to adapt or disable the 
single table inheritance configuration for FrontendUserGroup.

Best
Maba