I want you to know that helping you is our priority, @Just_me.
At this time, there isn't an option to void a vendor's invoice or bill. You can edit the line items to zero it out instead.
I'll also submit a feedback ticket to our product developers. Feature requests can be included in future product updates.
For updates, the following sites below will always keep you up-to-date:
If there's any else that I can help you with, let me know in the comments.
