Metering systems optimize for customer experience. Audit trails optimize for reconstructability. Those goals collide when prepaid credits roll into a new term without a clean event.
In several cohort workpapers we reviewed last year, the largest unexplained deferred balance moves came from three patterns: silent rollover of unused credits, mid-period plan resets that zeroed meters without a journal, and “goodwill” usage grants created in support tools with no corresponding contract amendment.
Start with the credit ledger, not MRR
Ask engineering for the table or API that stores credit grants and consumptions. Sample grants that lack a contract ID. If support can create value without finance visibility, your recognition check is incomplete regardless of how tidy the MRR chart looks.
Rollforward with an explicit “meter gap” line
Add a reconciling line for meter adjustments that never hit cash. Forcing that line into the workpaper makes reviewers confront whether the gap is policy, error, or undocumented discounting.
What to document
For each exception above threshold, keep: grant timestamp, actor (system or human), related invoice or lack thereof, and the recognition decision. That packet transfers cleanly into the Control Mapping sheet we use in the flagship course.