io87 Odometer Teltonika FMC150

I connect CAN reading to FMC150 teltonika device: io87 shows the correct milleage, but odomoter not. How can I set up de io87 AVL as the correct odometer in traccar. (settings in device are correct):

Operator 20610
Odometer 31531.69 km
io83 0
io87 6632000

Use computed attributes to override odometer with the value of io87.

Thanks. Can you tell me the code how to write this?

https://www.traccar.org/computed-attributes/

Could you advise on my code, test shows the correct amount but not replace the odometer with io87

odometer = io87 > 0 ? io87 : odometer;

You have to remove the assignment.