(21)As regards transfers of funds from a single payer to several payees that are to be sent in batch files containing individual transfers from the Union to outside the Union, provision should be made for such individual transfers to carry only the payment account number of the payer or the unique transaction identifier, as well as complete information on the payee, provided that the batch file contains complete information on the payer that is verified for accuracy and complete information on the payee that is fully traceable.