If you are sure that the parent issue is synced before sub-tasks we recommend to use a simpler configuration that works for both Jira Server and Jira Cloud.
Let's consider you already have the Connection configured between two JIRA Instances.
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Create files from the Exalate public repository
We store external scripts for Jira Server in a public repository. Copy the code from the repositories below and create .groovy files. You must keep the file names as below.
Upload the files to the $JIRA_HOME/scripts directory
Configure Sync Rules with the scripts provided below:
Add the snippets below to the end of the Sync Rules.
Add the code to a new line at the bottom of the incoming sync rules block.