Installation:
FarmingSimulator19/data/maps

If you want to install modifications on the map which has custom maps_fruitTypes.xml find this line in the main map xml (e.g. mapDE.xml) map:
<!-- <fruitTypes filename="$data/maps/maps_fruitTypes.xml" /> -->

In the InstalationHelp.png the line you need to replace is selected

Replace it with this line:
<fruitTypes filename="maps/maps_fruitTypes.xml" />


Modification incompatible with the map with additional crops! You must manually edit maps_fruitTypes.xml file.
Keep copies of original files!