If you want to edit the data field "map" within a activity profile, you end up in a query "use mappoint" (yes/no).
This means that it is not possible to set the data fields on the map.
Profile Settings - data pages - map - edit
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Edit :
I have since found out that it is apparently possible to initially edit the layout of the map data fields.
So the BUG described above only occurs when you want to edit the map layout of a second activity profile.
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