Take it to the dealer. your computer is reading incorrectly. for an oil change, when reset, your computer should read about 24000km, or 15000 miles.
as for the one that says 14000km, do you know how to access the "service info" on your instrument cluster? if you do, tell me what the symbol looks like that goes along with this reading.
also... I have an idea.... I'm a BMW tech. if you give me the last 7 digits of your vin number, I may be able to access service information about your vehicle, and tell you almost exactly what's going on.