Web not cut entirely in system components

Tekla Structures
Not version-specific
Tekla Structures
Environment
Not environment-specific
Question:
When I use some system components with rat holes, the web is not cut entirely, but a slice of 0.4mm remains uncut. Why?
Image
04mm_web_remains_uncut.png


Answer:
This is a hard-coded value set to prevent solid errors. If the cut would locate exactly on the same level as the flange surface, there would be a risk of solid errors in the model. 
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