Your Administrator can set up cell editing restrictions in schedule sheets. These restrictions can allow certain work groups to edit specific dates in the sheet, and prevent other groups from editing these dates. If you are a member of a specific work group that has these restrictions set, you will find that you are able to edit only certain cells on the schedule sheet.
The following image shows an example of the impact on dates in a schedule sheet with activity-level editing configured, and with activities and group-specific date columns. In this example, the groups Const, IT, and ATM all have group-specific start and finish dates for activities:
As shown in the example, the date cells in the schedule sheet that are specific to a certain group can be edited only by that group.