How to add the past ETC data?

Document ID : KB000109651
Last Modified Date : 01/10/2018
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We add the past ETC in a Task allocation screen and save it. However it is disappeared. Why? We would like to add past ETC in a Task allocation screen. Is there a way to add it?
The ETC is calculated automatically by using Actual. As a result, if Actual is added already, a Timesheet is posted. the past ETC cannot be added, and which is working by design. In order to add the past ETC, you need to create a new Task. If no actual is added to an existing task, you will be able to add a new ETC to the past week.