The previous commenter is not correct. Parliament votes for its own position on this law, which is then negotiated with the Council ( the 27 national government representatives) which itself has already developed a position. The two institutions negotiate a compromise (wir support from the commission as broker) which then both institutions must vote on in order for it to become EU law. So they can still vote something down later, but generally if it comes to a vote on the final text it is already a position parliament agrees with. In the EU processes laws that are unlikely to be agreed usually don't even get to a vote, rather the commission withdraws it's proposal and provides a new one.