It is necessary to add a field of type unit_magnitude to change the priority 'p' for a given unit, together with the values of the priorities, for each 'unit ' considered. It can contain the following fields: <unit>
The parameters are as follows,
n - Name used to reference the field, especially when writing the .dat file.
pn - Label that will be visualized by the user. It can be translated.
default - Default unit for a specific magnitude..
SI_base -Unit based in the international system units for a specific magnitude.
active - It is the default unit shown in the user interface, for a specific magnitude.