CCPR/C/21/Rev.1/Add.6 page 8 may be clear as to what obligations of human rights compliance have or have not been undertaken. Reservations may thus not be general, but must refer to a particular provision of the Covenant and indicate in precise terms its scope in relation thereto. When considering the compatibility of possible reservations with the object and purpose of the Covenant, States should also take into consideration the overall effect of a group of reservations, as well as the effect of each reservation on the integrity of the Covenant, which remains an essential consideration. States should not enter so many reservations that they are in effect accepting a limited number of human rights obligations, and not the Covenant as such. So that reservations do not lead to a perpetual non-attainment of international human rights standards, reservations should not systematically reduce the obligations undertaken only to those presently existing in less demanding standards of domestic law. Nor should interpretative declarations or reservations seek to remove an autonomous meaning to Covenant obligations, by pronouncing them to be identical, or to be accepted only in so far as they are identical, with existing provisions of domestic law. States should not seek through reservations or interpretative declarations to determine that the meaning of a provision of the Covenant is the same as that given by an organ of any other international treaty body. 20. States should institute procedures to ensure that each and every proposed reservation is compatible with the object and purpose of the Covenant. It is desirable for a State entering a reservation to indicate in precise terms the domestic legislation or practices which it believes to be incompatible with the Covenant obligation reserved; and to explain the time period it requires to render its own laws and practices compatible with the Covenant, or why it is unable to render its own laws and practices compatible with the Covenant. States should also ensure that the necessity for maintaining reservations is periodically reviewed, taking into account any observations and recommendations made by the Committee during examination of their reports. Reservations should be withdrawn at the earliest possible moment. Reports to the Committee should contain information on what action has been taken to review, reconsider or withdraw reservations. -----