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When attempting to register an ArcSDE table or layer as versioned, this error message may appear.
"Failed to register as versioned. Unique indexes cannot be specified for multiversioned tables [<owner>.<tablename>]"
The table has a unique index other than the one on the ArcSDE-maintained registered row ID column. This occurs for several reasons; for example, autoregistering third-party tables with preexisting unique indexes, or adding unique indexes to geodatabase tables using SQL or another database tool.
The steps to accomplish this differ among databases. Refer to the documentation for the database for details.