Error in releasing billing document to accounting

Hi All,

While releasing a billing document , i am getting error as : No Valuation segment exists in the material master record for product xxxxx.

However on further analysis it is found that in order to valuate line item for COPA system is reading valuation segment in different plant where material is not created or extended.

Also it gives message as " The system tried to read the product cost estimate according to costing key XXx as defined in the CO-PA Customizing settings."

I have checked settings also.

Even costing key has been defined for plant specific and assignment to any characteristics also defined correctly. (KEPC)

Thanks in advance

Avinash