Hi Rhoda,
as to your second point: a solution for this was delivered as part of the SAP customer connection program,e last year in note 816423
This allows you to manually influence the grouping of the employee to have an additional criterion to determine leave entitlement.
AS to your first point: I can't quite see, what the purpose could be. Sure, you could change time dependencies accordingly, so more than one EE Subgroup assignment could be captured. But the field is setting the default value of the same field in PA, IT0001. If there is more than one value, it cannot be decided, which one is to use. So, in that respect, it doesn't make sense. Then it's easier and better to just leave the field empty in OM and have it filled manually in IT0001.
most comoanies don't used that field in OM anyway.
kind regards
Sven