I need clear field “Actual finish” the task parent

Summary:

PEM I need clear field “Actual finish” the task parent

Content (please ensure you mask any confidential information):

I need the parent task to have the same date as the child task, in this case with an empty date, I tried to enter the parent and clear the field, but the field is not editable, is it possible to release this field to clear the field or clear the field like the child task?

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