thanks for your answer, but this is noct the solution for my problem.
In the screenshots above you see in the Epic BSAP-84 the keyword "EoG".
In the task BSAP-93, wich is linked to Epic BSAP-84 you see in the brown field "Ohne Stichwort-BSAP-84". My expectation now was, that I will see "EoG-BSAP-84" in the brown field.
I had the same problem, and this question was the only result on Google. So maybe an answer can help others here.
In my case the problem was simply, that I converted a Story to an Epic. The name of an Epic (field "epic name") is not the same thing as the title of an Issue/Story/Task ("summary"). So the newly converted Epic was without name, which showed up as "Ohne Stichwort", or "Unlabelled" when switching to English. Even though the epic name is a required field, it can be empty when converting from another issue type.
So it seems this is just misleading on Jira's part here, it should be "Unnamed" instead of "Unlabelled"
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