(7)By virtue of its obligation of oversight under Directive 2009/65/EC, the depositary should set up a procedure to verify on an ex post basis the UCITS' compliance with applicable law and regulations and its rules and instruments of incorporation. This should cover areas such as checking that the UCITS' investments are consistent with its investment strategies as described in the UCITS' rules and offering documents and ensuring that the UCITS does not breach its investment restrictions. The depositary should monitor the UCITS' transactions and investigate any unusual transaction. If the limits or restrictions set out in the applicable law or regulations or the UCITS rules and instruments of incorporation are breached, the depositary should act promptly to reverse the transaction that is in breach of those laws, regulations or rules.