Hi @matteomandrile​ 

EPSG:3794 is not not in FME, but FME does give you the ability to create your own Custom Coordinate Systems .

Also if you check the comments of this post one of our Safers, Dave created Custom Coordinate Systems for EPSG:3794 I will also attach the zipped folder here.

Hi @daraghatsafe​ ,

I did not know that FME allows me to create my own CRS, thats great!

Thank you for sharing the post and the data, much appreciated!