I have created a custom coordinate system (cs) with the online tool. My cs is in the correct folder (c:\\user\\xxx\\Documents\\FME\\CoordinateSystems), I can see it in the menu Tools-Browse Coordinate system... , I can transform some points but when

If you included an Esri WKT string when defining your coordinate system, please open the .db file in your c:\\user\\xxx\\Documents\\FME\\CoordinateSystemExceptions folder that matches your cs file data in a text editor. Check that the WKT is complete, and contains no carriage returns.

If you did not include an Esri WKT string when creating your coordinate system, please create a new .db file in that same folder with the following content:

ESRI|<your coordinate system name>|<Esri WKT with no carriage returns>

The .db file contents map your custom coordinate system to an Esri WKT string that is used whenever you write to an Esri format.