Billing document of Invoice Correction not release to Accts

Hi Sapers,

We are facing a typical issue on Invoice Correction not released to Accts. The error being the sales order cost estimate is not found through costing key.

This invoice correction document is follow on docuemnt of a billing document of a MTO order and the material type FERT is determining the Costing key. SO similar to sales order system looks for sales order cost estimate for invocie correction and blocks the billing doc.

Please suggetc the solution. It will be suitably rewarded through points.

Regards,

Chaitanya