Autoscheduling is Changing the Task Date even though there are no Dependencies or Assignments

Document ID : KB000077074
Last Modified Date : 11/04/2018
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Issue:
When autoscheduling in the PPM Gantt, a task's start and/or finish date is changing even there is no dependency, constraint or resource assignment.

Steps to Reproduce:

1. Create a new project in PPM
2. Create two new tasks:
  • Task 1 -  Start Date: 03/09/2018 and Finish Date: 03/19/2018
  • Task 2 - Start Date: 03/14/2018 and Finish Date: 03/120/2018
3. From the Autoschedule drop down, select 'Autoschedule with Options'
4. Enter an Autoschedule Date of 03/09/2018
5. Click Autoschedule

Expected Results: Start and Finish Date of Task2 do not change
Actual Results: Start Date has changed to 3/9/2018 and Finish Date has changed to 3/15/2018 for Task 2
Cause:
This behavior is working as expected with PPM Autoscheduling. Because there are no dependencies or anything such as a constraint to keep the date from changing, it's scheduling the second task to happen as soon as possible in the project.
Resolution:
To keep the task from moving, some things that can be done include lock the task, add a dependency, or add a constraint to the task. 
 
Additional Information:
Reference KB000008847 - When Autoscheduling in the PPM Gant or Open Workbench (OWB), all ETC is getting scheduled for one day for some assignments
Reference KB000029379  - OWB Autoschedule does not schedule correctly when Max % Load is set to 100% and Resource Constraints is Checked
Reference KB000051700 - What are the basic rules for Autoschedule?
Reference KB000046114 - How do Resource's Allocation dates impact Autoscheduling in the Gantt for tasks with assignments? 
Reference Automatically Create Project Schedules with Autoschedule for more information on Autoscheduling including how to lock tasks