Ready!API 1.2.2 Issues with loading partial XML soap request in SOAPUI NG

Context: migration of test cases from SoapUI Open Source to Ready!API 1.2.2 - SoapUI NG

What we need to do: the request xml files are huge, but we need only a few fields from there, so we can specify only those fields without loading the entire xml file (if we use the xml tab).

The issue is that in the Form is impossible to see the fields if the full xml file is not loaded.. we get the issue: "Do you want to recreate a default message from the schema?"

Can you indicate me how can I solve this issue?

Br,

Claudiu Adam