Problem
We have an Entity ShopMaterialAlloc with some Custom Fields

I want to create a Tab List in “Shop Floor Workbench” Page to show “Where Used Material” based on association between “ShopOrderOperation” and “ShopMaterialAlloc”
OPERATION_NO - CF_MATR_WHERE_USED_OPER
ORDER_NO - ORDER_NO
RELEASE_NO - RELEASE_NO
SEQUENCE_NO - SEQUENCE_NO
In Projection Configuration for “ShopFloorWorkBenchHandling” I can’t select “ShopMaterialAlloc” as Child Entity though it should be an entity known to “ShopFloorWorkBenchHandling”

I already have other tabs in “Shop Floor Workbench” showing Custom Entities where this works fine

So how can I create a new association to “ShowMaterialAlloc”