Currently the NoReplace event mode will Append data if a value with the same timestamp as the snapshot comes in. Customer would like an event mode that would discard the value if there is existing data with the same timestamp regardless of the value for both archive data and snapshots.
This is critical for the following scenario:
Data was fed to PI from a source system
Based on the data, an operational decision was made
later own, it's discovered that the data wasn't accurate at the source. The data is fixed at the source system
If the fixed data will overwrite the data that was used for making the decision, there's no audit for why the descion was made.