GRPO Document

Hai,

i Create a  Grpo Document for Two jobwork item .  Same Customer , Same Warehouse but different Itemcode JR10001 and JR10002.

When i created a GRPO document for Item JR10001 we can add the Document. But JR10002 Document Could not Added . Some Error Showing “Purchase balance Account Defined in item group and Ware house”

both item I checked the all like item Group , set GL Account method, valuation method, item group account , warehouse Account All are same .but When i will Add the GRPO document for JR10002 item , Could not Add.? How to solve this issue? If I will defined Purchase Balance Account in Item Group And Warehouse Document Will be Added.