Dear Garg
Order I Rule 10 CPC empowers a Court at any stage of the proceedings to implead the "necessary and proper parties". Necessary parties are those "who ought to have been joined" i.e. parties necessary to the constitution of the suit without whom no decree at all can be passed; and proper parties are those whose presence enables the Court to adjudicate "more effectivelly and completely" on the points involved in the case.
Hence, where the Court below instead of addressing itself to the important question as to whether the addition of the petitioners as parties was necessary in order to enable the Court to completely adjudicate all the questions involved in the suitrejected the petition, in my considered view, the order of the Court below really amounted to a refusal to exercise a jurisdiction vasted in it and the same should, therefore, be set aside in Revision under Section 115 CPC though it was held way back by the Hon'ble Supreme Court that it was for the lower Court to feel satisfied as to whether or not it should exercise its powers under Order I Rule 10 CPC and such exercise of discretion could not be interfered with in Revision since it could not be said that the order relating to addition of parties was a matter concerning the jurisdiction of the Court. [Refer AIR 1958 SC 886 : 1958 SCJ 1214]
Besides, please note that order passed by the Court below under Order I Rule 10 CPC does not come within the definition of "decree" in Section 2[2] CPC and, therefore, there can be no Appeal against such an order.