If you already have a credit invoice in 4-2 Payable Invoices/Credits, and you have received a check from a vendor, use this procedure to apply the check to your account.
To apply a vendor check to an outstanding accounts payable credit invoice:
Open 4-2 Accounts Payable Invoices/Credits.
Locate the outstanding credit invoice.
From the menu, select Edit > Copy Invoice.
From the menu, select File > New.
From the menu, select Edit > Paste Invoice.
Type the original Invoice# in the Reference# box.
Change the original Invoice# to the check number sent by the vendor.
In the grid, change the original Quantity to a positive value.
For example, if the number is -1, change it to 1.
Press Enter, and then verify that the Total is now a positive value.
In the grid, change the original Account to the checking account that will receive the deposit.
Save the invoice.