WorkFeatures and iParts
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If you have a workplane in a table based iPart (or even custom iPart) for that workplane to be visible in when inserted in an assembly (i.e. when it is an occurrence in an assembly) then you need to include it using the iPart author.
If you don't do that you'll get a com error 80070057.
Here is the sequence:
In this way "TopWP" will be accessable with your program from the assembly.
Here's another graphical explanation:
Text, images and diagrams © 2021 Owen F. Ransen. All rights reserved. (But copy the source code as much as you want!)