System

Reads the submitted document, then fans out three read-only validators over it — the form's service dates against the document's, the service period against the PO window, and the invoiced hours against approved time. Their three verdicts fold into one disposition: approve, hold or reject.

Takes a week of day-level hours and splits it at the PO boundaries the days actually fall across, writing one dated receipt per PO. Those dates are the thing a receipt arriving in Coupa never carries, which is what every exception on the other workflow exists to recover.