Hi,
As of SAP entrerprize structure , P grp is an iinndependent entity . where as purchase org can either be linked to a plant or can be an independent entity ,
as per your earlier message , your destination is to see plant based P grp . Normally under a plant different p grps can operate to create PO . A p grp is a buyer and a plant can have many buyers and like wise the P grp .
I do not think so that such kind of enhancement is needed rather to go head with sap standard rather use the role concept to link that buyer p grp to that plant .
Regards,