[v11] POS Invoice upon submit says: "Customer is required against Receivable account"

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.

This only works if you set an income account not a receivable account.