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This is what is happening - I have a Curtain Wall Unit Template that has several parts in it, all with filenames beginning with "-" (i.e. "-MM.ipt" for Male Mullion) and when I do a copy design, I copy it to a folder such as "101".  I open the new assembly and the Occurrences_Rule iLogic code then goes in a renames all of the occurrences to "101-xx" for example.  This part is working great.  Then I complete the customizations to that unit and drop it in a new Master Assembly.  Still, all is working great.  I go to Vault and Copy Design "102" and make the custom changes to it and drop it into the Master Assembly.  It works fine too.  If I close the Master Assembly and reopen it, that is when I get the error.  If there is one Subassembly in the Master, I never get the error, but as soon as I add the 2nd unit subassembly in, that is when the errors start.  Again, the units are fine and nothing breaks, but the error message is annoying because it keeps popping up.

 

I have added a screencast to demonstrate the issue.  I have left out the copy design process as I don't believe it is relevant to the issue.  So I have 2 units that I will open, configure, and then place into the master assembly and then you will see the error.

 

iLogic Error when adding to Master Assembly
https://knowledge.autodesk.com/community/screencast/0a7faa95-6718-4613-8af9-81c98b9f7cae

** If my reply resolves this issue, please choose Accept Solution **
Scott Hallmark, Design Specialist | Fluor Corporation
Inventor and AutoCAD Certified Professional, Autodesk Certified Instructor | My Plant3D Notes | AU Speaker | ROLL TIDE!