Hi Abdullah,
thanks for the explanation. We're now back to the original question which I now realise is not very clear.
In the customizing "Configure FIeld Attributes per Client" I added BUPA and then I proceeded to find the field that corresponds to BP Grouping but I cannot find the correct field which corresponds to BP Grouping. I set the field "Partner Grouping" (Field Group ID 1751) as mandatory but I dont see it reflect accordingly on the UI.
So which field will correspond to BP Grouping in the "COnfigure Field Attributes Per Client"?
PS: This is what I selected as Required. Not sure if Partner Grouping corresponds to BP Grouping but cannot find any other fields that seems to be more accurate.