3376095 - Association validation is not coming for MDF object

Child entity Division has an association to parent entity Business Unit.
Saving a jobinfo with a selected Division but an empty Business unit fails with error "Division “XXXX” is not associated with business unit “null”. Check the division data object configuration and enter a valid business unit. "

Because the association Division->Business Unit is not satisfied.
Hence, this is expected.

Child entity Business Unit has an association to parent entity cust_group (cust_group is an MDF object). 
Saving the jobinfo with selected Business Unit but an empty cust_group does not fail. 

Why doesn't fail?

SAP SuccessFactors Employee Central

This is a known gap in Centralized Services.

Currently we don't add error if fieldCriteria has mdfSystemInternalCode. This is planned to be implemented in b2405.

ECT-215433, Division “XXXX” is not associated with business unit “null”. Check the division data object configuration and enter a valid business unit, mdfSystemInternalCode , KBA , LOD-SF-EC-FOO , Foundation Objects (Organisation, Pay and Job Structures) , Known Error