This activities is used to define how Change Control is going to be handled for your Schedule Of work.
When SOW Change Order Required is enabled, Schedule of Work Change Order need to be created to update your Schedule of Work item lines once Schedule of Work is in Approved or Workstarted status.
When SOW Change Comment Required is enabled, you have to specify Change Comment for your Schedule of Work Items.
Schedule of Work created
SOW Change Order Required, SOW Change Comment Required defined