Setup G/L account in PO based on Material group

To setup G/L account in PO based on Material group (used for Non-stock - NO material)
OMSK - Create valuation class

Assign valuation class to Material group:
SPRO -> MM -> Purchasing -> Material Master -> Entry Aids for Items Without a Material Master 

Assign G/L account to Valuation class
OBYC -> GBB -> (CCGR + VBR + <new val class> = G/L accnt)