Ok, I figured out 'why'. I did not chose a source doc 'type'. I was able to add HL7 2.3.1, however, when I tried to add XML, there were no schemas to pull from-

I tried multiple XML target classes. None seemed to have a pre-defined schema. I expected that I would find 'at least' one that contained the same kind of medical data type tags as you find on the HL7 schemas. Is there an XML schema like this, and, how do I load it into my new DTL item?

I fixed that, but, it did not fix the original issue, in the 1st post above-

The configure production screen is still frozen-

Nice! Thank you John!