If I'm not mistaken, BMW part numbers are 11 or 12 numbers. Usually the 7 digit number is your last 7 from your VIN. Certain modules store info. that are specific to your vehicle and those modules synchronize info.

In the GT1 DIS version I used, it discovers the vehicle and already knows the 7 VIN digits. I guess with SSS/Progman you have to manually enter them?