Use the $ACTIVATE command to activate to the z11 checkpoint level. The $ACTIVATE, LEVEL=Z11 command expands the JES2 checkpoint to support functions that are enabled with the z11 checkpoint level. JES2 will reject the $ACTIVATE command if certain conditions are not met. For information about a complete list of new functions that are enabled by z11 activation, see $ACTIVATE command in z/OS JES2 Commands.

The $D ACTIVATE command provides an exhaustive list of reasons that block checkpoint activation to the z11 checkpoint level. It is suggested that you use the $D ACTIVATE command before attempting an activation to the z11 checkpoint level.