You do not reverse posted checks in Accounts Payable. You must use the Reverse Transactions screen in Bank Services to reverse a posted check.
When you post the reversal in Bank Services, you can choose whether to reinstate the associated invoice in Accounts Payable, if the invoice information still exists. However, you cannot reinstate an invoice if the vendor has no record in Accounts Payable (for example, if you reverse a miscellaneous payment to a one-time vendor).
Note: If your Sage 300 system uses security, you must have authorization to use the Reverse Transactions screen in Bank Services.
For more information about reversing a posted check, see the Bank Services help.
If you have not yet posted the payment, see Voiding a Printed Check.