NO_ASSIGNMENT Rejections in AUD: Supplier Cost Interface

Can someone please advise the correct method for clearing No_Assignment rejections in the AUD: Supplier Cost Interface report for both iExpense reports/employee travel invoices where inadvertantly an expenditure item date was entered when that employee was not a valid employee.  The rejection reason is given as No-Assignment. There appears to be no validation of the employee status in AP and it is only at interface from AP to Projects that a rejection occurs.

For iExpense Reports, we have found that for the rejecting line, if the expenditure item date on the distributions tab in AP is changed to a date when the employee had a valid assignment, the invoice then successfully interfaces to the project and distributes correctly.