Open Status set from Edit applicant Status set configuration and check for particular status , the required option is not greyed out.
SAP SuccessFactors Recruiting Management
That happens because the option "Collect comments if this status is skipped" is enabled.
To be able to set a status as Required, you must uncheck the option "Collect comments if this status is skipped":
Now you will be able to make the status as Required.
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