Define Parameter in Description.ext
example:
class Params
{
class PARAM_ACEMEDICALOVERDOSE {

		title = "    Overdosing:";
		values[] = {false, true};
		texts[] = {"Disable", "Enable"};
		default = true;

};
};
and get the value with BIS_fnc_getParamValue
then the values DataType is altered into Number which causes errors if you need correct DataTypes