I tried to create new screen scheme fo Epic issue type and when I associated to a specific project it give me the following error:
There are 2 sub-tasks that will be affected by this change. You must have at least one valid sub-task issue type.
what shall I do here? thank you
This question is not answerable because it's wrong. Changing screen schemes will not give you that warning.
You must be changing something else, almost certainly the issue type scheme.
The warning message is telling you that it cannot do what you have asked it to without damaging your data.
Your options are
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