Art. VIII 2 (b) IMF Agreement (International Monetary Fund Agreement)

Section 2. Avoidance of restrictions on current payments

(a) Subject to the provisions of Article VII, Section 3(b) and Article XIV, Section 2, no member shall, without the approval of the Fund, impose restrictions on the making of payments and transfers for current international transactions.

(b) Exchange contracts which involve the currency of any member and which are contrary to the exchange control regulations of that member maintained or imposed consistently with this Agreement shall be unenforceable in the territories of any member. In addition, members may, by mutual accord, cooperate in measures for the purpose of making the exchange control regulations of either member more effective, provided that such measures and regulations are consistent with this Agreement.

Referring Principles
Trans-Lex Principle: V.2.4 - Distribution of currency transfer risk
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