What does "cannot migration from subtype [] to []" mean when generating migration rules?

asked 2015-01-22 11:56:59 -0600

I'm generating new migration rules for bag files that will be appended to existing migration rules. When generating the new rules I get messages like this:

WARNING: Within rule [some_rule] cannot migration from subtype [some_type] to [some_type]

What does this mean? Is it something that needs to be fixed? It's still generating rules for me, and they seem to be okay.

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