Return incomplete forms, send purchase orders, file agreements. Every one is ready to run, and you can adjust it in plain language.
Put each unapproved bill due soon on the follow-up task list.
Get clear follow-up tasks for bills nearing payment, so your payables person knows which approvals to chase.
Mark bill tasks when invoiced quantities exceed receipts.
Your bill reviewer sees the quantity gap or missing receipt ID on the task, so they can decide what to do with the supplier bill.