edges cluster rank compound

Edges through cluster

Hi Folks!

Does anybody know, what to do to prevent that edges are going through clusters/subgraphs?
(p.ex. the edge from BoxenModul1 to BildverarbeitungsModul goes right through BoxenModul2)
Hier you can find the the source code:
http://nopaste.info/66ce58b90b.html
And here is the output file:

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