Make sure that order of items is preserved in a sale (or purchase) process
When proceeding an order or a purchase from offer to delivery to invoice, it can occur that the order of items in one of the later steps is not the same as in the initial.
For checks, finding mistakes etc. that can be confusing, especially if collective invoice is in the game.
So please: Make sure that order of items is preserved during the complete sale (or purchase) process in all steps.