Posting Error Urgent!!!!!!!!!!

Hi All,

when i am saving billing document i am getting the error... Thanks in advance

No account is specified in item 0000001012

Message no. F5670

Diagnosis

No account was specified for account type "S" in item "0000001012" 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 "0000001012" of the FI/CO document.