The variable values are only entered in the maintenance data, if the maintenance task is newly created. Otherwise the old values stay.
If a device is created and no variables are linked, the initial value stays in the maintenance task. Also in this constellation the variable values in the maintenance task are not overwritten, if the variable is entered later. A message is displayed, if the variable needed for the maintenance calculation still has the initial value. The variable value only can be changed by executing a repair, a device exchange or a maintenance task.