On this tab, you can provide the details of the settlement from the customer-side.
The Mutual Settlement (create) form. The Accounts Receivable tab
...
Make sure the GL Accounts column shows the GL account to be updated by the transaction 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 used for settlement.
The tab toolbar buttons
Click the Add button to add a line for a list of customer-side documents.
...