The billing batch method allows you to review and modify orders before finalizing them and posting for account invoices. You can apply price adjustments, tax changes, freight charges, etc., at this time. It also gives you a chance to review Exceptions.
Typically an order will be sent into the billing batch after it has been signed for or ship confirmed, depending on branch settings. This creates a delay between the time of shipment and the final invoice: for example, an order delivered on a Monday may not be invoiced until Tuesday. Sales reports based on invoice data will reflect this delay.
The instant post method creates an invoice at the time of Shipment Confirmation. This bypasses the batch and review process entirely. The customer receives an invoice at the time of delivery, and/or emailed or faxed overnight, depending on customer master configuration. Additionally, sales reports are accurate up to the minute, as orders are being invoiced in real time.
Although corrections or other adjustments can still be made, they will require entering new credit order or voiding the original invoice and re-billing. Optionally, you may implement a hybrid method where Exceptions can still be sent into the billing batch.
Note: For Point of Sale Orders, instant post is instant. It does not wait for shipment confirmation.