The secondary truncation point identifies the page that contains the begin transaction statement of the most recent transaction that was sent to the Replication Server.
Message: 4213, State: 1, Severity: 16 -- ’Page 2561 in database ‘MY_DB’ cannot be used as a truncation page because the page is not allocated.’
The rs_locater table in the Replication Server system database tells the RepAgent where to set the secondary truncation point in the Adaptive Server log. This error is expected if the truncation state is set to ignore and the log is truncated. The RepAgent then restarts without resetting rs_locater.
To solve this problem, set rs_locater to zero and restart the RepAgent.