Editing or adding new shifts via manage shift to on call calendar does not take effectIssue <!-- div.margin { padding: 10px 40px 40px 30px; } table.tocTable { border: 1px solid; border-color: #e0e0e0; background-color: #fff; } .title { color: #d1232b; font-weight: normal; font-size: 28px; } h1 { color: #d1232b; font-weight: normal; font-size: 21px; margin-bottom: 5px; border-bottom-width: 2px; border-bottom-style: solid; border-bottom-color: #cccccc; } h2 { color: #646464; font-weight: bold; font-size: 18px; } h3 { color: #000000; font-weight: bold; font-size: 16px; } h4 { color: #666666; font-weight: bold; font-size: 15px; } h5 { color: #000000; font-weight: bold; font-size: 13px; } h6 { color: #000000; font-weight: bold; font-size:14px; } ul, ol { margin-left: 0; list-style-position: outside; } --> Symptoms For a particular rota , users are are unable to edit or add new shifts via manage shifts. Steps to Reproduce Navigate to On-Call calendarsIn the upper right corner of the On call calendar header, click the toggle filters button to open the calendar display and select the groupSelect a schedule/calendar item for user say "user1" and click manage shiftSelect the rosterSelect a different member other than the one selected from the drop down.Set the start and end dates to future datesClick ScheduleNothing changes Cause Missing mandatory configuration. Resolution The cmn_schedule_span entry was missing for the schedule of this rota , due to which the changes were not getting reflected. Find out the scheude for this rota i.e the cmn_schedule record and check for the schedule entries. If there are no schedule entries for this schedule (which ideally is never the case), created a new schedule entry ie cmn_schedule_span record by clicking new in the scheduled entry related list and the issue will be fixed. Additional Information Read More about On-Call Scheduling here - On-call Scheduling