I am sorry, but the case information you have provided is incomplete and inaccurate. Section 49(a) is a provision within the Registration Act, 1908, and not a case title. The "Union of India - Subsection" is also not a valid court designation. To provide an accurate summary, I need the actual case name (e.g., ABC v. XYZ) and the court that decided the case (e.g., Supreme Court of India, High Court of Delhi). Without this information, I cannot fulfill your request.