@Stephan-Dornberg The handling of POI's in the MRA route planner is a bit odd at the moment. If you bring in a number of waypoints from Google MyMaps to form a route it will accept : GPX, ITN, TRF, TPF, KML, KMZ, TAR.GZ.
Files and the enhanced information for the waypoints (but not the hyperlinks) are retained. To do this you just export the relevant Waypoints from MyMaps (you can select just the waypoints you want in mymaps it does not have to be the whole dataset) and download them to your computer as KML and then upload them directly as KML to MRA route planner. They will come in as a route joined by roads.
POI's can only be uploaded as OV2, GPX, CSV. MyMaps can export waypoints as CSV but for that data set the location information was not coming over correctly. I'm sure you could correct this in the CSV file using Excel or Google Sheets. However, in this case I took a shortcut as Basecamp can import KML/KMZ files from MyMaps directly then export them as GPX. When I imported the GPX file created by Basecamp to the POI library of MRA routeplanner the spatial/location information was correctly read and displayed in MRA. This takes much longer to explain than to do 😄 If MRA could import POI's directly from MyMaps KML/KMZ files it would be helpful.