Passing a bill is a complex process. We deal with it on a daily basis. The process takes time and it's left to the whims of the elected officials, who are called upon to vote on the issues.
Let's go back to the hypothetical case I gave you. Parliament passes the expense budget, in the form of appropriations, for one year. Have you considered that the budget proposed in the government's bill may be higher than the authorized limit? Could these types of disparities occur? Through this type of bill, could Parliament pass a budget that exceeds the authorized limit?