Import Credit Note Quantity as a Negative figure

When reporting on Sales Transactions it can be useful to see how much of a product a customer has used. Currently, we import credit note quantity as a positive number, so when looking at a summary of the quantity of these lines it is shown as greater than expected. For example you could have sold 58 of an item but ended up with 18 being credited. Being able to see in your reporting that only 40 were actually used would be beneficial.

We already import the value on credit note lines as a negative number, and having the quantity as negative would line up with this.