Hi saurabh, this article might be helpful which goes over the aspect you have raised – Deccan Herald says the One year MBA is the first MBA in India.

The AMBA accreditation link for IIM L is available at this link – IIM L AMBA

As the accreditation page would show, IIM L’s One year MBA is accredited by AMBA as afull time MBA. The two-year PGP is accredited as an MIM.
The WMP is a part time programme and AMBA accredits it as an MBA – part time (or Executive MBA)

IIM L’s declaration on the website does not specify which course has been awarded which accreditation.

It says that “The Association of MBAs (AMBA) has accorded accreditation to institute’s PGPM, IPMX, and WMP programmes. Accreditation has been awarded for five years from November 2011 to October 2016”. Can you please clarify?