I don't want the Optional elements in XML message to be automatically added by ReadyAPI

Good afternoon,

I am using ReadyAPI 3.1.0

There was a big difference between my XML message yesterday and the message today.

It looks as if ReadyAPI has automatically added all kind of optional elements in the message without me knowing about it. 

This is very disturbing!

Example of message as defined yesterday:

Original XML

Example of the same message as it looks today:

Why does REadyAPI make these changes? I don't want that.