Cannot create nameMapping template

TC 14.80.627.7 x64,
Chrome 90.0.4430.212

Hi, i watched a demo that use nameMapping template, but when I try to create one, I got the error : "A template cannot be created from the Sys node that was mapped by selectors."

I try in "Mapped Objects" section and "Aliases" section. I also try with a new object.
Using XPath expressions and CSS selectors is enabled.

Try with a new project.

Video demo that I watched (go to 33min) : https://smartbear.com/resources/webinars/test-maintenance-tackling-the-hardest-part-of-func/?ws=A

Is it possible to create nameMapping template for web element ?

Thx to the SmartBear Community !

Martin C.