Hi Helge,
Have you managed to resolve this, or do you still require help in this matter.
If there's no validation error, and you've double checked your modelling to make sure it conforms with the tutorial, I would suggest sending it to us for a quick check. To do so, export your project (via File > Export > Tersus > Tersus Project File) and attach it to a reply message.
Regards,
David
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