Preliminary
When the sketch object is created, it is in the Preliminary state. Files
can be checked in, checked out and updated.
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Complete
When sketches are final, the object is promoted to the Complete state.
Only the owner of a sketch can change its state. No files can be checked
in while the sketch is in this state, but files can be checked out. If
files need to be changed, the owner can demote the sketch.