I have a quick question on the EB3 to EB2 porting.

I had PD Oct 2007 with employer A on EB3, and now I changed the Employer B and they have filed me under EB2.

Employer A didn't provide me the I-140 approval or receipt copy. I had LIN Number and filed FOIA and got my previous (EB3) I-140 document with approval seal, including Alien number etc..

My Employer's B lawyer is asking to provide either the I-140 Approval copy or Receipt copy from my previous employer and says that he can't port my old priority dates with the FOIA copy I received.

My question is :

1. Do we really need exact approval or receipt copy (from previous employer) to port EB2 dates or the LIN Number or FOIA approval notice sufficient ??

Thanks in advance.. please reply in detail at the earliest

thanks