You receive the notification event when trying to replicate "Retrieval of local changed data for replication requested by remote server failed during retrieving data! [reason: USN is mismatched! (the table max USN is larger than the global max USN)]"
This error means that the remote partner requesting replication is starting from an update sequence number (USN) which is larger than the Symantec Policy Manager’s (SPM) current max USN. This can occur by restoring the local SPM to an older date, the older SPM database max USN is smaller than the remote partner's last replication USN. Essentially the remote partner wants to continue replication at a point that doesn't exist on the current local database.
To resolve this issue, you'll need to reset the USN value for the local database.