“Thus, having regard to the law laid down by the Supreme Court and provisions of the Act, in our opinion, whenever registered documents such as Development Agreement-cum-GPA, is sought to be cancelled, execution and registration of such a document/deed must be at the instance of both the parties i.e., bilaterally and not unilaterally. Ifadeed of cancellation is allowed to be registered without the knowledge and consent of other party to the deed/document, sought be cancelled, such registration would cause violation to the principles of natural justice and lead to unnecessary litigation, emanating therefrom. In any case, as stated earlier, in the absence of any provision specifically empowering the Registrar to entertain a document of cancellation for registration without the signatures of both the parties to the document, the deed cannot be entertained. Moreover, if the Registrars are allowed to entertain a deed of cancellation for registration without signatures of both the partiesto the document sought to be cancelled, such power would tantamount to conferring the power to decide disputed questions between the parties. No party to the document would ever approach for cancellation of registered document unilaterally unless there isa dispute with the other party in respect of the subject matter of the document”.