Incoming invoice not get posted through workflow

Hi Experts,

I am working on workflows for incoming invoice used by bus2081. i am facing the problem when the user clicks on post button after verifying the invoice the workitem not posted .and is it showing debit and credit miss match . while posting it with out workflow the document was posted with out error even debit credit miss match

please give me the solution to overcome from this problem .

Thanks

Sreenath