This field is used to store the unique key for the record. This key is calculated by the ACT sequence number counter. By default, this counter is made up of a sequence number made up of 15 characters. This counter is provided as standard with an automatic operation, but its allocation can be manually performed. To ensure the correct functioning of the Task object, it is strongly advised to conserve these standard characteristics. The ACT sequence number counter is shared by the Tasks, Appointments, Calls and Actions objects. Indeed, this is used to exploit the functionality and the Crystal Report reports working with the notion of commercial activity in its broadest sense.