Customers who paid Orders during a POS session may require an invoice to be delivered (in addition of a cash receipt);
Such invoice are to be delivered only for some products included within the Pos order (usual case being for products associated with a warranty, whilst other items are not included into the invoice).
Question: would such invoice duplicate the sales turnover: one sale through the POS transaction and the other one when validating the newly created invoice?
And how to tell the system that the invoice has been already paid? : I see no way to link the payment with the POS.
The way I see it is that at the Point of Sale the Debtors Account is credited and the Cash/Bank Account set in the journal debited. So the system starts from a payment. To generate a corresponding invoice which will Debit the Debtors Account cancelling out the Point of Sale payment you go to the Daily Operation Menu and choose Orders and there you can generate the invoice easily