Originally Posted by
dvs7310
Your friend got it to credit to Miles & More because it had an LX code. Miles & More is the "home" program of LH, LX, and OS, so any flights with their code should credit regardless of operating carrier.
Don't believe that's right. Within *A, credit is determined by operating carrier. By contrast, OW credits based on marketing carrier.
This sounds to me like an error by M&M.