An apparatus, a method and a system arrangement are disclosed for executing an order from a user, in which it is necessary to check authorization to execute the order from the user. The authorization to execute the order is defined in a rights context. When the order is given by a user, the rights context for the order is recorded, checked and frozen for the duration of the order so that it is possible to ensure that the order can be executed fully even when the rights context is changed at the time of execution.