(e) on any claim for the award of a pension in respect of injuries sustained by a person while serving under the Government of India or the Government of a State or under the Crown in India or under the Government of an Indian State, in a civil capacity, and any question as to the amount of any such award, and it shall be the duty of a Public Service Commission to advice on any matter so referred to them and on any other matter which the President, or, as the case may be, the Governor, of the State, may refer to them: Provided that the President as respects the all India services and also as respects other services and posts in connection with the affairs of the Union, and the Governor, as respects other services and posts in connection with the affairs of a State, may make regulations specifying the matters in which either generally, or in any particular class of case or in any particular circumstances, it shall not be necessary for a Public Service Commission to be consulted