The reason on a credit note should be set to the reason the customer has returned the goods. The reason controls which of the Book In, Write off, Add to Returns can be used.
What is the difference between Book In, Write Off and Add to Returns?
Book In puts the items back into stock.
Write off The items are not put back into stock. For example, when the items are to be thrown away.
Add to Returns The items are to be returned to a supplier. These are items are not added to stock, they are added to a lists that can be found by selecting `Stock, Returns, Create returns` from the main menu. For example, Items that are part of a product recall or return under a warranty.