[curt.clifton]

Just guessing here, but have you tried to manually create the necessary contexts in the target document?

I wonder if that, combined with exporting/importing through OmniOutliner, might work. My rationale is that the trip through OmniOutliner would strip identifier codes from contexts and reduce them to just their names.

Also, if the context information is lost when copying from one OF document to another, that sounds like a bug. Be sure to use Help --> Send Feedback to report it so it gets into the Omni bug tracker.

Good luck.