My main client is setup as a RESALE vendor yet I constantly have warnings of problem calculating tax on invoices. How do I fix this crap?.

Hi there, majortom.

We'd like to get more details about your concern. Can you share the exact warning or message about the sales taxes? Is the vendor also set up as a customer?

Please reply back to us to share more details. We'll get back to you as soon as we get more details. 

Sorry I didn't make my post clearer. When I encounter an issue it is in Invoicing a client setup as Resale. They also are a customer. But I rarely deal in that realm. So if changing their name as a customer would fix the issue, that would be painless. If I see the exact error again in the next few days, I'll post it.