On your side of the table while your partner implements.
The symptom
The partner is building. Your controller is doing two jobs. Nobody is checking that history ties or that reports will work on day one.
What we do
Migration loads with source documents attached. Reconciliation back to the legacy system. Cutover pre-flight and runbook. Reporting design. User testing. The partner owns configuration. We own the data, the verification and your position.
From the record
Open payables at cutover traced document by document to zero. A feared double-post tested instead of debated. A project subledger tied to the GL by period, and the one missing month found. Four mapping rulings driven to decision in one week.
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