when I save the project related invoice distribution following error is raised.

Hi , May I ask a question?

when I save the project related invoice distribution following error is raised.
"The default workflow for the Oracle Payables Account function Project Supplier Invoice Charge Account has not been customized.
Please replace the dummy function in the default process for account generation by your own account generation method".
Even after I customized project supplier invoice account generator workflow and related the account generator, the error still exists.

I don't know how to deal with this problem. Who can tell me the method of solution? Thank you  very much.

Jerry.