We have two automation rules.
1- Copy comments from Parent to Child
2- If Parent re-open then re-open most recent closed Sub-task. While re-open the Parent then a Comment is also required. So we want to Trigger this rule first and then later it copy the comment.
What about merging the rules in rule 2?
For ex; you can use {{trigggerIssue.comments.last.body}} to get the comment in parent transition.
If this is not the case, you need to set a flag in first rule and second rule should be triggered when this field/flag changes.
Or if there is dependency, do not forget to check this box in second rule.
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