Aaah - one of the main reasons to print your cheques on blank cheque stock and let Adagio Payables add the MICR at the bottom of the form, since this cannot happen.
Sorry, there's no way to change the cheque numbers once everything has been posted. It would break the audit trail. That's why there are all those questions about whether everything printed OK!
Place a not in either Ledger or Payables about the differing numbers if they've already gone out the door. You'll have to match the cheques manually in BankRec.
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Andrew Bates