wages on Labor certification doesn't meet current wages


Registered Users (C)
Hi guys,
My labor certification is approved recently and preparing to apply I140. The problem is my current wage doen't met which is agreed on labour certification. I know my Green card is for future employment but HR department doesn't want to apply I140 becuase my current wage doesn't met with Labor certification, they want some kind of statut or section from law which says that it is okay to go ahead with current salary and salary, which is mentioned in Labor certification can be given after person getting green card. Is there any satute or section number in law which says that agreed salary can be given after getting green card. please help me.Thanks!