Negative Quantities for Xero users
If you want to credit off items from billable items (eg. from a fixed price quote that isn't editable), you can do so.
Always use negative dollar values not quantities. The reason is other systems like Xero that we link to won't work (won't be able to send an invoice for example).
For example:
-1 widget @ $50 NOT okay
1 widget @ -$50 okay