Wrong assignment for similiar courses

[koenidv]

Example FC/TL: Different sports courses with the same teacher are being confused (even though PF/GK).

This is because the internal id parser cannot check for a matching GmbId due to Sph's restrictions and selects the first similiar course if there are multiple.

1. We could implement PF as LK, which would fix this very example but would come with some drawbacks as well ("Sports LK" in my courses, even though its PF).
2. The user should be asked which course he belongs to if we're not sure.