1. Member States shall require the institutions and persons covered by this Directive to refrain from carrying out transactions which they know or suspect to be related to money laundering or terrorist financing until they have completed the necessary action in accordance with Article 22(1)(a). In conformity with the legislation of the Member States, instructions may be given not to carry out the transaction.
2. Where such a transaction is suspected of giving rise to money laundering or terrorist financing and where to refrain in such manner is impossible or is likely to frustrate efforts to pursue the beneficiaries of a suspected money laundering or terrorist financing operation, the institutions and persons concerned shall inform the FIU immediately afterwards.