A calendar control where you specify the start date of the next rolling wave period. Any date prior is considered within the Detailed Planning period where you should not have any Planning Packages according to DECM test 29A601a - Is all effort detailed planned within the current rolling wave?
The default date for the Start of the Next Rolling Wave is the project's end date. If your project has any Planning Packages, you may need to change this date in order to evaluate the results of DECM test 29A601a.