Hi,

Please configure the outstanding account in the accounting settings or in the journal. To configure the outstanding accounts in the company level, navigate to Accounting/Invoicing -> Configuration -> Settings, Under the default accounts section, you can see the fields to configure Outstanding accounts, please configure the accounts here.

If you need to set it at the journal level, Accounting/Invoicing -> Configuration -> Accounting -> Journal, Open your journal, in the incoming payments and in the outgoing payments page, click the 3 dots in the tree view and make the outstanding receipts and outstanding payments accounts visible in both page respectively and set the value there.

Thanks & Regards

Walnut Software Solutions