Check purchase facts, compare invoices, request missing proof. Every one is ready to run, and you can adjust it in plain language.
Give requesters a specific list of files missing from contract packets.
Your requester sees exactly which contract files are missing, while the approval stays in correction for follow-up.
Link the prior sign-off to a new review of changed requests.
Your operations lead gets a fresh review when signed-off work changes, with the old terms and required reviewers ready.