The new requirement follows extensive changes to Indian immigration which started in October 2009, when India's government cracked down on foreign nationals working in India on business visa status, asking thousands of workers to leave the country.  Since then, a raft of changes have been introduced, along with new forms and a quota system for employment visas.  This latest requirement for a "justification letter" is a logical progression from Section B, 5 (i), (ii) and (iii) of the Ministry of Home Affairs' "Frequently Asked Questions" document, first issued in late October 2009.  That publication is available at this link http://mha.nic.in/pdfs/work_visa_faq.pdf.