Duplicate items in USS Data Sources:
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Duplicate rows in os_ExternalSource and os_ExternalSourceProperties tables in the USS_mdb database.
To solve this issue there are 2 options:
1. Remove duplicate rows in os_ExternalSource table and references through sourceID in os_ExternalSourceProperties table in the USS_mdb database.
2. Uninstall USS and perform a new USS installation so a new database is created. More information about uninstalling USS: