If you are having problems with unapplied cash payments, there you can learn how to fix unapplied payments in Quickbooks You could resolve the problem with unapplied customer payments and credits and unapplied vendor payments, for example. You can also use the profit and loss report to correct the unapplied payments to invoices. You can use QuickBooks Online incognito mode or run the verify and rebuild data utility if you're still having trouble with unapplied payments.