urgent!!! 急问皮老师、8老师和各位大侠，H1B transfer

Hi,

My 6th H1B will expire in Nov.2013 and only 9 months left.And I have I-140(perm) approved through my current company A. I got an offer from another company B, but its attorney told me that if transfer my H1B to new company B, I can only transfer the remaining time (9 months), so my offer will be canceled.

I wonder if the attorney is true, or I should get 3-year H1B since I have I-140 approved. And where I can find the policy/documents to show to the attorney?

Thanks a lot!!!