On this tab, you can provide the details of the settlement from the supplier-side.
The Mutual Settlement (create) form. The Accounts Payable tab
...
Make sure the GL Accounts column shows the GL account used for the debt and presented as a link. Click the link to open the GL Accounts dialog box.
The GL Accounts dialog box
Select another GL account if needed. Click OK to save the replaced GL account and close the dialog box.
The tab totals
The Total (Acct. Cur.) field is populated with the total amount in the accounting currency to be written off to the selected income GL account.
The tab toolbar buttons
Click the Add button to add a line for a list of supplier documents.
Use the Pick button to add the supplier documents.
Use the Up and Down ( 
) buttons to rearrange the documents in the list.