Reconciliation begins with understanding the records available from each system. Define the identifiers, dates, amounts and status values that can be compared, and document where interpretation is required.
Separate matched records from exceptions that need review. Give the operations team a clear explanation of the difference and an accountable resolution workflow. Avoid hiding discrepancies behind a single total.
Test with late updates, missing records and duplicate imports. Agree reporting formats, access roles and retention needs. A reconciliation interface should help people investigate the source of a difference and record what they decided.