thank you for your response! I have made some screenshots to find out, if this issue is a regular bevahiour of yED or somekind of an unexpected behaviour.
Screenshot 1 shows the main window from a high level perspective. Just as an overview.
Screenshot 1: main window overview
Screenshot 2 displays my node C which is called "staging.ST_Auftragsview" (the blue one). As you can see, there are four in-going edges and two out-going edges.
Screenshot 2: main window node detail
Screenshot 3 illustrates the overview of the successor window which irritates me. Just to give an impression of the amount of objects in the successor window (38 nodes). The red rectangle borders the problematic part of the screenshot. The graph in the successor window ends at the blue node, although screenshot 2 shows that there are successor in the main graph!
Screenshot 3: successor window overview
Screenshot 4 details the overview from screenshot 3. You can see, that the yellow node "staging.v_Rechkopf_Rechpos" leads to the blue node "staging.ST_Auftragsview" and ends there. I would have expected, that another two edges would lead from "staging.ST_Auftragsview" to some other nodes as shown in screenshot 2.
Screenshot 4: successor window node detail
So, I don't know why this happens. The nodes seem to be correct since I see what I expect to see in the main window, but not in the successor window.
Screenshot 5 displays a diffrent successor window which starts from the yellow node "staging.v_Rechkopf_Rechpos". This time I get what I expected. The yellow node leads to the blue node and this one leads to two other nodes.
This is why I am confused. Why does it work in the second case, but not in the first one.
Screenshot 5: another successor window