i am getting this error while doing pgi

Account determination for entry DDEL GBB DDEL VAX 7920 not possible

Message no. M8147

Diagnosis

The system did not find an account for this transaction. This means that the account determination for key DDEL GBB DDEL VAX 7920 is not maintained in MM Customizing (Valuation). The key is made up of:

Chart of account

Transaction key (= Posting transaction)

Valuation grouping code

Account grouping code

Valuation class

System Response

The system cannot update a G/L account for this transaction. You cannot post the transaction.

Procedure

Contact your system administrator.

If you have the authorization, check the Account determination in Customizing for Valuation.

Proceed

Note

The relevant posting transaction can be found in Table T030A.