Hours, costs and margins: check the calculation basis
Recorded hours are not necessarily approved, billable or invoiced hours. For a project report, specify included statuses, period and the source of rates. Before calculating a margin, verify that costs and revenue use the same time basis and currency.
Request a readable formula and a list of missing data. If a consultant's cost is absent, the model should not replace it with an undisclosed estimate. Use the analysis to identify what to verify in the app; then compare periods or projects using consistent criteria.