Production conformation with production order

hi gurus

when i am doing the production conformation with production order i am getting the following error.

No account is specified in item 0000000001

Message no. F5670

Diagnosis

No account was specified for account type "S" in item "0000000001" of the FI/CO document.

System Response

The Financial Accounting program cannot process the document.

Procedure

A system error has probably occurred in the application you called up. Check the data transferred to item "0000000001" of the FI/CO document

any idea.

regards

padma