Error during MIGO

Dear All,

We are getting following error during MIGO

"Account determination for entry RUBA BSX 0001 not possible"

We have checked, there is a mistake in Material Master Creation. Accounting View of material is created but no valuation class selected in Accounting view of material master.

Now system is not allowing us to enter valuation class as Purchase Requisition and Purchase Order already prepared.

Is there a any way to add valuation class without change/delete of purchase documents ?

If we cancel purchasing document then it may possible that system will alow. But there are complex releasing stretegy of PO as it Raw Material PO.

Thanks and Regards,

Nirav