Field help (VEHCO2RAT) 

This field cannot be entered and displays the tax rate corresponding to the CO2 emission rate of the vehicle.
The price list corresponding to the tax rate is entered in the miscellaneous table 631 - Carbon emission rate (Rate 1).
Upon printing the report used to prepare fiscal statement 2855, the taxation amount is determinated according to the taxation rate entered (full price, or 50% exonerated) and tax rate that can be applied.