(17)An "initial service agreement" may be considered to be for example the opening of a bank account, acquiring a credit card, concluding a portfolio management contract, and "operations" may be considered to be for example the deposit or withdrawal of funds to or from the bank account, payment by credit card, transactions made within the framework of a portfolio management contract. Adding new elements to an initial service agreement, such as a possibility to use an electronic payment instrument together with one's existing bank account, does not constitute an "operation" but an additional contract to which this Directive applies. The subscription to new units of the same collective investment fund is considered to be one of "successive operations of the same nature".