It would be good if a sales order could be amended without having to undo all the fulfilments and invoices.
So an additional product could be added, or an existing product increased.
Understand nothing could be amended that would mean one of the fulfilments wouldn't work properly however adding products or increasing volumes to original order would be good.
We have clients who make a single order/reserve for the season and it often occurs that we need to reduce their order. Re-authorising all previous orders is a pain.