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When a sales order is processed, the General Ledger and Debtor record is updated accordingly.
Invoice Orders
The advantage of Invoice Orders are that they can be processed in batch using the Process Orders menu item.
The disadvantage is that back order records are not created unless the order is processed.
Active Orders
The advantage of Active Orders is that multiple deliveries can be made on the same snapshot. For example, customer orders 10 on Tuesday and 4 are allocated. Backorder records are raised for 6. The user can leave the order unprocessed as D01. Then when stock arrives on Friday, use the Manual Back Order Release form to deliver the 6. The History Comment on the sales order line shows 10 being delivered. It doesn't show the 4 and then the 6.
The disadvantage is that Active Orders must be processed from the sales order entry form. They can't be processed in batch from the Process Orders menu item.