ABAP : System fields overwrite

Changing the values ​​of the system fields can destabilize the normal running of the system.

You should never overwrite the values ​​of system fields, even if they are available as variables. System fields are used by the runtime to communicate the system state to the ABAP program. Overwriting these fields can lead to loss of information necessary for normal operation.

Although the ABAP system fields are variables, only some of them can be modified by the program or user.

System fields in ABAP programs can be overwritten in rare cases only, to control system behavior.