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You can see a timeline for all sources for an instrument by pulling up the symbol on Audit > Symobls page, clicking Edit under Action, and then "Show Data Sources".

Changes to the security master active timeline are made under the following circumstances:

1. If any material change is received and your PropReports instance has only one source for historic data. The active timeline will be updated as of the date changes are received.
2. If the symbol is an incomplete option and PropReports receives option specifications that your system is missing (e.g. the underlying security), PropReports will update the option with the changes regardless of the number of sources for historic data.
3. If the current Like an incomplete option, if the symbol is missing a multiplier, we PropReports will update the multiplier regardless multiplier regardless of the number of sources for historic data.
4. If the Cusip/Isin or description are is missing we , PropReports will set those once received from any sourcethem from the first source received.

 Note: merged data can be overridden manually.