I have a Sales invoice and once I am choosing include payment I get an error message upon Submit which I can’t make much sense of
Sales Invoice ACC-SINV-2019-00003: Customer is required against Receivable account [receivables account name]
If I make an identical SINV which is NOT set to POS (include payment) I can submit the invoice and process a payment entry against it without any problem.
That error occurs if you set a default receivable account for the invoice item. It should work if you also set a customer in the item but I cannot get it to work. Works fine if you remove the receivable account from the item. Have not tested in relation to POS but probably related.