L1, L2 Visa

I would like to thank this website for enough information provided which I had browsed thru posts till 2012 to know the different questions asked and was confident to answer. But there was some surprise awaiting for us to know there is much more which we don't know about L1B :-) I would like to put our experience forward which might help someone as it was rare case where we heard nowhere.

July 8 and July 9 we had our appointment dates to submit the documents and interview accordingly. On July 9th, myself and my spouse attended the interview. Below was the conversation.

VO: GM Sir.
Me: GM Mam.

VO: So you work for YYYY company Sir.
Me: yes

VO: Your company does this etc etc in US Sir
Me: Yes (I think she knew pretty well about my company)

VO: What is your specialization.
me: Explained

Then she was all happy with our response and about to stamp. Then she looked at her monitor more keenly and a surprise awaited for us. She told that your company HR has filed your petition under incorrect number. Please approach your HR team and I am sorry I cannot approve your visa. We were awestruck with her response as we did not know anything about this kind happened anywhere. We did not lose our hopes here. I went and spoke to my HR team and explained the issue. They immediately consulted the US embassy who responded and asked to reappear for an interview. Till date we don't know what the issue was. We reappeared on 24th July and visa was approved.

As far as I understood usually company files L1 B Blanket visa under same petition number for all employees. So I don't know if VO misunderstood this as L1 B individual which has different petition number for each employee.