assessable value not maintained for the material X

Dear all,

i have maintained material chapter ID,Plant and materialchapter id combination ,assessable value , cenvat determination, and vendor excise details in the transaction J1ID .

Even after maintaining all these conditions , i am not able to save the po,while saving the po i got a error message that assessable value not maintained for the material X..

Points will be rewarded for useful suggestions.

Thanks in Advance.

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