I understand that Quickbooks doesn't support issuing RCTI's (receipt created tax invoice), and have been doing them manually outside of QuickBooks for some time with a word doc RCTI template I have.

Instead of issuing an RCTI,  would I be breaking any rules by issuing an invoice that has a negative dollar amount?

So for example instead of issuing an RCTI from the client to our business for $500 inc gst - could I just send an invoice to the client from our business to them for '-$500' or a credit/credit note of $500?

I'm sure its been asked before but couldn't find anything on this topic.

thanks