Hi Luqman,
You can find the BP Grouping as an attribute BU_GROUP under the entity BP_HEADER of BP data model.
You can set this attribute to mandatory in various ways:
- Data Model level - Setting the Required Flag via MDGIMG->Data Modeling->Edit Data Model
- BRFPlus Validations - MDGIMG->Data Quality and Search-> Validations and Enrichments -> Define Validation and Derivation Rules
- BAdI: Define Validations/Derivations (USMD_RULE_SERVICE)
Hope this is helpful.
Best Regards
Uday Rao