It seems not possible to search for issues which relates to a certain issue.
At least I don't find this field in the Advanced Searching - Fields Reference.
On the other hand it is possible to show this column by customizing the Issue Navigator.
BTW: During customizing the fields are shown in German, in Advanced Search I have to use the field name in English. So I never know the exact field name I should use in the Advanced Search.
Any help appreciated.
Thanks