Yes you can certainly copy a user field across on create. Here's an example rule:
Project automation - Code Barrel JIRA 2017-01-24 08-45-49.png
So I simply used the edit issue action to set the 'Reviewers' user custom field (in your case this would be 'Impacted user'). The trick then is to use a smart-value to set the reporter. Simply type this in the field:
When the rule executes, this will be evaluated to be the username of the reporter of the issue that was created. Hope that helps!
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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