The correct term is viativos, with v. They are monies awarded to an employee for travel expenses or expenses of Commission outside his city's work. It is also an additional fee which is paid out wages, employees who must travel in Commission out of place of work, ordered by their employer.
biaticos is incorrectly written, and should be written as "per diem" being its meaning:
Economic benefit of workers and employees, to carrying out work on Commission outside their places of assignment, with this, the company or the employer ensures that the costs generated by their Commissioners in the areas of transportation, food and accommodation, do not go to the detriment of ordinary perceptions.