Map employee and vendor costs to contract reimbursement rules before preparing client invoice support. The working definition should name the covered entities, accounts, period, source systems, cutoff, preparer, reviewer, and the event that closes a row. A queue is useful only when another person can tell what is ready, what is waiting, and what decision remains protected.
For this workflow, record engagement, expense ID, traveler or vendor token, date, category, amount, currency, receipt, contract rule, markup, client approval, invoice line, and status. Use stable identifiers from the governing systems. Free-text notes may explain an exception, but they should not replace the transaction ID, source date, amount, status, or evidence location that lets the reviewer reproduce the result.