Hi Tanja,
So you have posted a check in Adagio Payables, then 6 months go by and the check is never cashed nor cleared through the bank. You need to remove it because it never hit the bank and never will.
Certainly one way is to Reverse the check in Bank Rec (the Bank GL account amount would be backed out), and also the reversal status would be sent to AP. The same check # would be Reversed in AP - that would 'unpay' all the invoices. Then you could deal with the invoices via a credit note or an adjustment or such to update the required GL accounts.
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Regards,
Softrak Tech Support