The task start date is no longer editable after actuals have been posted to that task.
Additionally, if there is no ETC hours remaining on the task (ETC = 0), the task finish (end) date will be read only as well and the system is not letting us change it.
This is working by design:
Release: All Releases
Component: Clarity Project Management
If you want to use the scheduling features of Clarity to develop a resource-driven schedule, you need to make task assignments and use ETC to convey the scope of the work for a given assignment. Clarity can then use its auto-schedule algorithm to set task start and finish dates or the project manager can override the suggested dates with their own dates.
Clarity supports both models:
We are always open to considering other models and encourage you to submit enhancement requests that explain how you use the product and how an enhancement could benefit you.