Steps to reproduce this issue are as below:
1. Create a new project
2. Allocate a few team members to the project (under the "Staff" tab)
3. Create a few tasks, says about 5 of them
4. Assign the team members from step 2 to the tasks from step 3 randomly
5. Display "ETC" attribute in the "Details" flyout of the Tasks, as well as in the list view of Tasks
6. Select a task, change its ETC from the "Details" flyout to 0
7. Keep repeating step 6
Actual Result: ETC does not change on tasks randomly
Expected Result: ETC changes on tasks as soon as it is changed in "Details" flyout
Due to a defect with ID DE52097.
The defect has been fixed in version 15.8.0.