@David-Kelly if you have solved it - fine.
But please consider: if you export as gpx file out of MRA, then in the file is both, your route and a track of it (hope, you know the difference between route and track).
I'm not familiar with BMW Navigator VI, but it's a branded Garmin. So, Garmins are importing your gpx file with both: the route and the track. You should be able to select, what (or both) should be visible on screen at Navigator VI.
In result: the route will be calculated by Navigator VI by internal algorithm. Means could be it's not exactly the same as you planned in MRA.
The track will be 100% the same.
You can select in Navigator VI different colours for route line and track line, then it becomes obvious, if the calculated route will really follow the original track.
There is another hint: may be, Navigator is not importing/showing route points on screen, if you have used by planning in MRA only shaping points as route points. Try to use via points (hand icon) in routes, then you will see it later on at Navigator VI too