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I need to incorporate a custom coordinate system definition into FME Form, but can’t find the right parameters in the online form to fulfil the definition.

The following parameters define the map projection, but e.g. ITRF does not exist anywhere in the online tool.

projection type: Gauss Kruger (Transverse Mercator)
reference ellipsoid. GRS80
datum / reference frame. ITRF2005
central meridian. 11° 20’
scale factor at central meridian. 1.0
false northing. 0.0 meter
false easting. 1000000.0 meter

 

How can I create a proper fme file with these parameters?

Best way to do this is using 

1.Create a new .fme file defining the system, Safe made https://fme.ly/coordsys to help start that process. Edit it as you need. 
2. Save it to %USER%\Documents\FME\CoordinateSystems
3. Restart FME Workbench to recognize the custom system and it will appear in the Coordinate System Gallery

I am sorry, but the page you linked is the ‘online tool’, as Safe calls it in the documentation: https://docs.safe.com/fme/html/FME-Form-Documentation/FME-Form/Workbench/coordinate_sys_custom_about.htm.
Edit as you need is easier said than done. As I wrote in the initial posting, there is not a single ITRF datum available in the list of the online tool.
I can edit the resulting fme file by hand and add the datum line myself, but then Form is not able to visualize the data read, and throws errors as soon as you want to inspect the features.

Because of all this, I posted all the parameters I have for the projection, since it is unclear for me on how I should define the fme file in the online tool so that these parameters are correct implemented. 

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