I think i found a bug and I don't know if it's reported.
I have the issue DEV-1000 that i previuly moved to a diverent project PRD-555.
I update some fields with the External System Import using the issue key DEV-1000.
After the update the issue had the id DEV-555 and the problem is that 2 issues with the same id exist. The External System Import update the project but not the issuenum.
I solve this with this page and now it's all working well, but I had to shut down jira and update direcly to the databese.
Is this bug reported?