E4754 Cmd Rej: S-Port Subscriber Differentiation feature must be ON
The S-Port Subscriber Differentiation feature must be turned on before the subdfrn parameter can be specified.
Recovery
Display the status of the S-Port Subscriber Differentiation feature. Enter the rtrv-ctrl-feat command.
If the feature does not appear in the output, then the feature is not enabled. If the feature has a status of OFF, then the feature is enabled but is not turned on.
Turn on the feature as necessary. Refer to the appropriate feature manual for assistance.
Re-enter the chg-sccpopts command that generated this error message.