European Union (Amendment) Bill

I wish to clarify the implications of accepting the instruction, because I am anxious if I vote for the Liberal proposition that I will be less likely to be successful in a motion that I would like to propose on yes or no. If the Liberals give me an undertaking that they will vote for a yes/no referendum on the treaty, I will vote with them on in/out. If not, I have to assume that they are guilty of hypocrisy.