Account Determination for entry 1000 KBS 0001 ---- 2030 error in MIGO

Dear All

A PO has been made with acc. assgnment as "Z" i.e capital order with account modifier as ZCA in OME9 transaction.For this account modifier and valuation class of material an entry is there in OBYC GBB trasaction..

But when I am doing GRN thru MIGOerror is coming as "Account Determination for entry 1000 KBS 0001 -

2030" not possible.

Is any more config is missing?

Pls help.

Regards

SK