Having previously worked with Jira, I thought once an issue has been moved from one project to another project, you could still find it by searching by the old "previous" issue id.
For example, if you move issue AA-123 to project BB and the issue becomes BB-532, you could search for "AA-123" and issue BB-532 would be a search result.
This didn't work in Jira OnDemand today (12/13/2011).
Is this a bug in Jira OnDemand or was I just imagining this functionality?