How I can prevent work log on parent issue closed

[Omprakash Thamsetty]

I would like to prevent the log work on subTask if the parent task is closed. How can I do that?

Users should not be able to log the hrs on subTask if the parent is closed. 

[Jack Brickey]

Does your vaild use case involve a parent being closed while sub-tasks remain? If not, I might approach the issue differently, such as use automation to close any sub-tasks if parent is closed. Normally, I see scenarios where, when the last sub-task is closed the parent is automatically closed but you could implement the reverse.