what it is says it's connected to other payments? do I still want to delete it? the problem is the sales tax was not paid and so there was payment not the full amount invoiced.
Welcome to the UK Community Page for QuickBooks Online.
Check the payment screen before clicking more, visually; you should see the invoice selected. If it's just the one invoice and it's as you'd expect to see it,then go ahead and delete and click yes to the messages.