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Save with references deletes all custom properties

Question asked by Peter Brinkhuis on Aug 20, 2020

I've been trying to work around this very annoying bug, while working with SolidWorks to get it fixed.


  1. I import an assembly from a STEP file
  2. I then call ModelDocExtension.SaveAs(silent+references). Everything is fine up to this point. My parts have 28 custom properties.
  3. I set a few custom properties, rename the component or set a material in the parts. It doesn't seem to matter what I do here.
  4. I call ModelDoc.Save3(silent+references) or click save in the UI with references.
  5. Now all my parts lose all of their custom properties. The list is completely empty


Does anyone know a way to save an assembly with references without using Save3?


I am working with SW2020 SP4, so there are no updates to run.