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Hi @mat_hijs ,

 

You might have already done this, but if you comment out all the lines of your function, and then un-comment them line by line, does this help you identify which line in the function is throwing the exception when running from the external rule?

 

That's the only suggestion that comes to mind. Examining the code, nothing occurred to me as to why it would not work with an external rule, but would with an internal rule.

 

I hope this helps.
Best of luck to you in all of your Inventor pursuits,
Curtis
http://inventortrenches.blogspot.com