Invoice shipped materials from a Delivery.
Once a Sales Order has been dispatched for delivery, an invoice can be created. Click on the invoice button to invoice a delivered sales order. Once an invoice has been produced it can't be changed so it is imperative the following is checked:
Once finished, click Process Invoice button.
A batch invoice, a single invoice created from multiple work orders/deliveries, can be processed if all items have been sent to the same location. Click the check-box beside each delivery and click the Batch button at the top of the column to make such an invoice.