The Reserve Bank of India (RBI) last month informed the Finance Ministry that it was "inclined to accept" the proposal of Tata to buy DoCoMo's 26.5 per cent stake at Rs 58 per share, half the rate which the Japanese firm originally paid.
Sources said the central bank said the "structure of the contract is such that the investor, in any circumstances, if it intends to exit, will receive at least Rs 58.045 or higher per share."
Taking into account RBI norms, the structure of contract between Tata Sons and NTT Docomo is not in line with the provisions as the fair value of shares is Rs 23.34 per share.
However, sources said the RBI is of the view that larger issue here is of a fair commitment in the contracts in relation to an investment and a downside protection of an investment, rather than an assured return.
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RBI has sought the Finance Ministry's views on it, sources said.
When contacted, a Tata Sons spokesperson said, "As you are aware, Tata Sons has made the necessary application to the Reserve Bank of India. The company is awaiting a response."
DoCoMo in July last year announced plans to exit Tata Teleservices, the seventh-biggest mobile phone carrier in India.