# ID 20825

Definition of (A)CS must not be changed if (A)CS is enabled.
Description | It’s not possible to change the definition of a coordinate system (CS/ACS) while it is enabled. [PROG// Section: Coordinate systems]
Response | Class | 2 | Abort NC program processing.
Solution | Class | 3 | Before redefinition deselection of the corresponding coordinate system.
Error type | 1, Error message from NC program.