a) the reservation is prohibited by the treaty;

b) the treaty provides that only specified reservations, which do not include the

reservation in question, may be made; or

e) in cases not falling under subparagraphs (a) and (b), the reservation is

incompatible with the object and purpose of the treaty.

Article 20

Acceptance of and objection to reservations

1. A reservation expressly authorized by a treaty does not require any subsequent

acceptance by the contracting States and contracting organizations or, as the case may

be, by the contracting organizations unless the treaty so provides.

2. When it appears from the limited number of the negotiating States and negotiating

organizations or, as the case may be, of the negotiating organizations and the object

and purpose of a treaty that the application of the treaty in its entirety between all the

parties is an essential condition of the consent of each one to be bound by the treaty,

a reservation requires acceptance by all the parties.

3. When a treaty is a constituent instrument of an intemational organization and unless

it otherwise provides, a reservation requires the acceptance ofthe competent organ of

that organization.

4. ln cases not falling under the preceding paragraphs and unless the treaty otherwise

provides:

a) acceptance of a reservation by a contracting State or by a contracting

organization constitutes the reserving State or intemational organization a

party to the treaty in relation to the accepting State or organization if or when

the treaty is in force for the reserving State or organization and for the

accepting State or organization;

b) an objection by a contracting State or by a contracting organization to a

reservation does not preclude the entry into force of the treaty as between

the objecting State or intemational organization and the reserving State or

organization unless a contrary intention is definitely expressed by the

objecting State or organization;

e) an act expressing the consent of a State or of an intemational organization

to be bound by the treaty and containing a reservation is effective as soon as

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