Remind reviewers, return incomplete requests, ask for missing evidence. Every one is ready to run, and you can adjust it in plain language.
Request missing invoice records before client bills move forward.
Your requester knows exactly what to add, and your approver can see why the bill is waiting.
Remind the next approver before a bill you track comes due.
Your next approver gets a reminder before the payment cutoff, with the follow-up recorded on the bill.