Changing Ignition Switch! BMW wants my Vin Number, WTF?

[Tymatk]

Hi all

I'm changing my Ignition Switch soon, waiting for 1 to come over from UK.

While waiting for the arrival of the Ignition Switch, i went into one of the local BMW dealer to find out how much do they want (out of curious). They quoted me $150 AUD and they also required the Vin Number.

Why? Is it standard security procedure?

When i change the new one over, do i need to do anything with the computer like register it in order for the ECU to regconize the switch?

Thanks