We only want to add ONE JIRA issue association to a Salesforce case, but there doesn't seem to be a way to prevent the user from adding multiple associations via the 'Associate' button and the JIRA pop-up screen in the Salesforce UI.
It will be good to allow us to have a way to restrict to only one Jira associate with one Salesforce Case/.
CASE #84909
Thank you for raising/upvoting and commenting on this idea. Our team has analyzed this idea and since this idea is not in align with our roadmap we will proceed and mark it as "Will not implement".