Reconciliation — export_a vs export_b
on invoice_id · matched on all fields

Mismatches by kind

Three largest by value

Every mismatch, with the reason

Invoice Account Reason ERP amount Bank amount Delta ERP date Bank date

Reconcile a different pair

Two CSVs, each with headers invoice_id, account, invoice_date, amount, currency. The ERP file is the source of truth; the bank file is checked against it.