Engineering WorkBench (V6.1)

I have a production person that is modifying a BOM and when she tries to make changes
to the Bill after being checked out, she gets an error "More than one ECORev records found
by a unique find. (3166). I checked every component in the Bill and cannot find any problems.
There are two revisions to this assembly, but none are approved.
Does anyone have any words of advice?
regards,



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