A faster report produces different totals. Establish whether the difference corrects an old rule or introduces a new defect.
Record definitions
Specify periods, filters and excluded statuses. Ask the business owner how late changes should affect previous reports. Use authorized historical examples.
Compare execution
Run both versions for the same cases. Trace each material difference to data or logic. A matching total can hide incorrect item-level results.
Prepare ongoing checks
Require repeatable comparisons and ownership of metric changes. Document expected differences before release. The supplier should price this business verification, not just moving a scheduled query. Acceptance needs numbers your team can explain and an operator who can detect a failed or incomplete run.
Related reading : Modernizing an internal approval tool: preserve decisions already in progress. Discuss your project scope with Sky Vaults.