Multiple I 140s

[raghu2808]

Employer A (Current Employer) filed for I140 and got approved in May 2014. Employer B filed for I 140 and got approved in Nov 2014. Employer B used my existing I 140 from Employer A to get the same priority date. After two yearz Employer B revoked the I 140 since I was not ready to move to his company, will there be any problem with the existing I 140 from Employer A. Is it still valid and can get extensions or I 485 using Employer A 140, I am still working with Employer A