(88)For the purposes of Article 25(2) of Directive 2014/65/EU, a transaction may be unsuitable for the client or potential client due to the risks of the associated financial instruments, the type of transaction, the characteristics of the order or the frequency of the trading. A series of transactions, each of which are suitable when viewed in isolation may be unsuitable if the recommendation or the decisions to trade are made with a frequency that is not in the best interests of the client. In the case of portfolio management, a transaction might also be unsuitable if it would result in an unsuitable portfolio.