### Duplicate Historical Data

Changes to the way duplicates in the collection of historical data are handled were implemented in SPM 7.0 and later versions. In older versions (pre-7.0), duplicates were automatically inserted and stored in the database. In post-7.0 versions of PME, data records are unique and no duplicates are inserted or kept in the database by default.

To enable the retention of duplicate data records in the PME database, change the `SaveDuplicates` setting in the Registry table in the ION_Data database to “`1`”.

If you prefer, you can use this SQL script instead:

`UPDATE [ION_Data].[dbo].[Registry]
SET Value = 1 WHERE Name = 'SaveDuplicates'`

This step is listed as being manual in the spreadsheet. Wondering: how will someone get a hold of the helper script? It's usually part of the SBS package...