It is assumed that the various banks apply different procedures for converting their customers' accounts.
Most banks implement the conversion on the basis of the same basic rules.
The EU Commission has made a number of recommendations, with which the process to be used by WestLB complies. Exchange of Book Money First of all, the banks should perform the conversion of incoming and outgoing payments between the 12 participating currencies and the euro free of charge. It does not apply, for example, for the conversion of dollar book money to euro book money. WestLB performs the conversion between participating currencies and the euro free of charge. Thus, the banks have a certain amount of leeway in the interpretation of this Commission recommendation.