There are times when we take used items on trade as part of sale (much like a car dealership). These would be SKU's that would already be in our system and are usually serialized but may not be.
It would be great to have a purchase line in a sale order that would allow us to select a SKU, add a serial number and a value. It then receives that item (at a location of our choosing) and value into our inventory and into the proper accounts.
It is important to have this on the same invoice because the client only pays tax on the difference.
I could see this being useful for others as well that have other items or services in kind that need to appear as a credit on an invoice.
Thanks for considering this.