SAP Message 3W503 - Invalid exception code entered for the bank branch

Diagnosis
Your bank has an exception code specified that does not exist in thesystem.

What To Do
Check the exception code entered for this bank.
Select 'Maintain entries'
Enter your project IMG number or choose 'Without Project'.
Select 'Maintain CDV Information manually'.
Choose 'Details' to see the valid exception code for the bank code.