I solved the problem. I was thinking about the hint i got from the newtons forum and suddently...
I just changed the wait(1); into wait(4); before calling "NewtonGetChildEntity" in "NewtonBallConst" in "NewtonScript2.wdl".
The test level runs but not the project. I dont know what do do, i tried to change the wait instructions to adjust the order of object creation. No effect.