The validator I use at the moment avoids changing the status of an issue as long as it's linked issue type is not closed. The linked issue has been created via handover transition in another project earlier in the workflow. This works fine. But if somebody creates the same link (implements) between two issues, it is not possible to change either of the issues statuses anymore. The user then should be able to close the issue. I already tried the "any but current project" but this does not work.
Is it possible to combine two validators for the same linked issue type?