Void SOP Invoice

Hi all,

I'm fairly new to GP and need some help.

One of our users created an invoice by mistake and transferred it to a backorder instead of voiding it. The transfer placed the original invoice in history with the original QTY. The problem is this shows are a sale and it is not correct. I don't seem to have a way of excluding this document from my reports. I can provide any additional info if needed.

Your thoughts please?

Thanks

PD