Thanks for the feedback.  However, at least in my case, the "Out of scope of Tax" is not a tax code, but is an option that you choose when you "do not want to have tax code".  Is a system option, rather than a tax created by us on our Quickbooks.  

I am showing you a picture below: We have some tax codes, but the option of "Out of tax scope" is the one we choose when we don't want to use any existing tax code.  

If you see below, when creating invoices, you have three (3) options: "tax included", "tax not included", and "out of the scope of taxes".  When you chose the last one, then you DO NOT need to select any tax code on the line details of the invoives.

HOWEVER, when you were importing invoices, at least until last week, the tax type (*ItemTaxCode field ) was a mandatory field, and among the options, was not "out of tax code".  That was the problem that triggered my message to you.

Now, it seems you have changed the file back to exclude that field as mandatory (or not even there).  So, at least for us, the issue has been resolved.  But would be nice to know what happend.

Thanks!