Perform As User
When choosing a user account to run a post function, the user account specified must have the appropriate permissions to perform the actions of the post function, for example, creating an issue or adding a comment.
JSU Add-On User (default): The JSU Add-On User account is added to an instance automatically when JSU is installed and already has the required permissions to perform all actions across JSU Post Functions. As long as the permissions haven’t been manually removed from the JSU Add-On User, there should be no impact to it being the “Perform as User” instead of another account.
If you don't specify a different option, the transition on the related issue is performed as the JSU Add-On User with its associated permissions. This option is useful for testing, and you can confirm the action in your issue activity.
When the JSU Add-On User makes changes to issues, you can see the changes in the Activity section of the issue:
Initiating User: The transition on the related issue is performed with the same user who triggered this post function on the origin issue. That user must have the necessary permissions on the related issue. In some restrictive setups, a user might not be allowed to perform the action or might not have permission to view the relevant project.
Choose User: Use this option to specify a different user account that has been granted the necessary permissions. Usually, this user account is assumed to be only technical (impersonation), with broad permissions, and not used for logging into Jira by coworkers.
In combination with the Permission Condition in native Jira, or the User Is In Any Users Condition from JSU, you can hide a transition from all users that do not have permission to execute it.
Initiating/Selected User
If you configure your post function for either the initiating user or a selected user, the relevant issue fields must be included in the associated issue screen.
For example, if you create a rule that updates a field in a related issue, the field must be included in the target issue Edit screen. Similarly, if you define a rule that creates a new issue, or copies a field to a new issue, the field must be included in the Create screen.