A Corporate CL60 First Officer resigned after a discussion with the Captain about the legality of flying with an inoperative weight on wheels switch led to disagreement over the MEL/CDL requirments.

Narrative

We had a 'Weight on Wheel' light come on enroute on a international trip landing at a foreign airport. FolloWe had a 'Weight on Wheel' light come on enroute on an international trip landing at a foreign airport. We followed flight manual procedures. On landing Captain said he would talk to our Maintenance people as to find out what to do the following morning. Captain advised that it was ok with the MEL/CDL and said Mechanic concurred. Flew to a domestic US destination where Captain chartered an aircraft for passengers. We flew to our home base; where weight on wheel switch was replaced. Upon returning to our base I questioned Captain again on weight on wheel switch. He pulled out the MEL and CDL. Upon my review I found no information on weight on wheel problem in MEL/CDL books. I advised Captain that we should have not flown the oceanic legs. He stated again that because item was not in the MEL/CDL and complied with the flight manual procedures we could complete the flights. I disagreed with Captain's assessment. This is not the first time Captain has demonstrated this poor judgment. Management is absent till Monday. I am to tender my resignation because of lack of trust in Captain's judgment and failure to have honest understanding of crew resources.