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Why do the numbers in different reports never match?
Numbers differ because of different definitions, time periods, filters, data sources, refresh times, duplicates, manual adjustments or errors. For example, revenue may be counted at order date in one report and invoice date in another. The fix is shared definitions and one governed source.
Investigating a mismatch usually means asking:
- Which system and extract does each report use?
- What date field and filters apply?
- Are refunds, tax and cancellations treated the same way?
- When was each report refreshed?
- Has anyone edited numbers manually?
Once causes are found, document the agreed definition and rebuild reports from the same data layer so the problem does not recur.
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