The Account Assignment Data Relevant to the Main Transaction Do Not Provide G/L Account

When I try to post a document in FPE1 transaction, in FI-CA, I Receive three messages:

G/L account could not be determined

The acct assgmt data relevant to the main trans. do not provide G/L acct

G/L account does not exist .But I Already assign G/L account in SPRO in (Automatic G/L Account Determination) and then i Assign (Accounts in Define Accounts for Receivables/Payable) and (Define Accounts for Revenues/Expenses).

Does anybody know how I can get rid of these error messages?

Thanks

Kind Regards

Faraz Sharif

SLCM Financial Consultant