Unable to change Project Start Date

Document ID : KB000102277
Last Modified Date : 15/06/2018
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Issue:
A Portfolio Lead is unable to change the Project Start Date.
Example: Project Start Date is 7/1/18; it needs to be changed to 8/1/18.
 
Cause:
Some of the resources have Mixed Booking, and their Hard Allocation Start date is 7/1/18.

Troubleshooting steps: 
1. Navigated to the Project -  Tasks - Task List page, clicked Show All on Filter, and confirmed that all tasks have Start Date 8/1/18.
2. Navigated to the Team Staff page, clicked Show All on Filter, and confirmed that all resources have Start Date 8/1/18. 
3. On the Team Staff page, clicked on Options, then Configure 
4. Added option 'Hard Allocation Start' to the Selected Columns, and returned to the Team Staff page. 
5. Now the Team Staff page displayed 'Hard Allocation Start' date for all resources.  Some resources have Hard Allocation Start on  '7/1/18'.  This is the reason why the Project Start Date could not be updated to 8/1/18.
Resolution:
Change the resource's Hard Allocation Start date. 
(Access Rights 'Resource - Soft Book - All' and 'Resource - Hard Book - All' are needed to update the Hard Allocation Start date.)

 
Additional Information:
- Project Start date not getting updated for Not started project
https://communities.ca.com/thread/98323159

- Project Start and Finish Dates
https://communities.ca.com/thread/6625086
https://communities.ca.com/thread/101416462