Is alternate accommodation agreement mandatory for purchase of resell flat in redeveloped building?

Hi, I am from Mumbai. I purchased an apartment in September 2015. It was a re-sell property in a redeveloped building. I had taken a home loan from HDFC Ltd for it. In the chain of documents, there is no alternate accommodation agreement between the redeveloper (builder) and the previous original owner of the apartment from whom I purchased. HDFC Ltd had sanctioned and disbursed the loan without it. Now, one of the members in our building was trying to sell his apartment. The prospective buyer approached HDFC Ltd for the home loan. In the requisite chain of documents, HDFC asked for alternate accommodation agreement between the builder and the owner, (for which HDFC did not ask for this document from us). So the owner had to call the builder and get this agreement executed. I have been informed by the Committee of the society that the builder did not made such alternate accommodation agreement with any original member and therefore now they are approaching the builder to get such agreement prepared. My query is - do I also need to get such agreement prepared for my apartment with the builder and my previous owner of the apartment so that my chain of documents have no issues and I do not face any trouble when I try to sell this apartment anytime in the future. Or is it not required in my case as the apartment has already been sold to me by the previous owner in 2015 and I have already paid the stamp duty and registration charges. Thank you.