Dear Client,
The Executing Court has the discretionary power to allow the application of a third party (TP) to be impleaded in an execution proceeding under Order 1 Rule 10 of the Code of Civil Procedure (CPC). However, whether the application is maintainable in the first place is a pure question of law that the Court must first determine.
The Supreme Court has held that the Court must first determine the maintainability of the application before exercising its discretion to allow it. In the case of Smt. Sushila Devi vs. Smt. Nirmala Devi, the Court held that "the question whether the application is maintainable under Order 1 Rule 10 CPC is a pure question of law which does not depend upon the facts of the case and the Court must decide it before exercising its discretion under the said provision."
In your case, the opposing party has raised a pure question of law as to whether the application of the TP is maintainable under Order 1 Rule 10 CPC. The Executing Court must first determine this question before considering whether the TP is a necessary party.
If the Court finds that the application is maintainable, it will then have to consider whether the TP is a necessary party. A necessary party is a person whose presence in the suit is essential for the adjudication of the matter. In other words, the absence of the TP would make it impossible for the Court to decide the case.