Rules and regulations of private or government organisations are man-made with an eye on their personal benefits. These rules are not to be treated as absolute laws. It is perfectly fine to do additional work and supplement your income as long as you are not hurting the interests of the main organisation or going against the national interest or engaging in activities that are detrimental to human progress. Such being not the case, what you are doing is perfectly fine.
Affectionately,
Alok Da


