You must open a schema or a file configuration that contains a schema, and open two different data file sets with the Data File Set and Compare Data File Set commands before using the Detect New UIDs for Named Objects command.
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Click File > Compare with File > Data File Set > Detect New UIDs for Named Objects.
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Browse to a results file in the Filename box.
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Select a class or view map in the Class/view map drop-down box.
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Click OK.