Hello Robin,
Sorry, I didn't realize you were using Adagio BankRec. You could (and in fact need to) Reverse the check in Adagio BankRec (the procedure is the same, although in BankRec you do not need to post a reconciliation - just mark the check for Reversal).
The reinstated invoice can be used when you issue replacement checks (in which case there is no need to adjust out the invoice).
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Andrew Bates