Hi,
Create Planning Group with the help of following Path:-
SPRO -> Financial Supply Chain Management ->Cash & Liquidity
Management -> Cash Management ->Master Data ->Subledger Accounts ->Planning Groups
Maintain this Groups in Structure by following path:-
SPRO-> Financial Supply Chain Management ->Cash & Liquidity
Management ->Cash Management-> Structuring ->Groupings ->Maintain Structure
Assign Planning Group to Vendor by T-code = xk02 and assign Planning Group in cash management group field in Accouting information data (where you maintain reconciliation account).
Assign Planning Group to Customer by T-code = XD02 and assign planning group in cash managemnet group field in Accounting information data .
Regards
Narinder Pal Verma