Hi Faith,
See the below sap help to understand the behaviour.
Displaying the Message Overview - Advanced Adapter Engine - SAP Library
- The overview provides statistical information about the number of messages processed within the specified time period.Consider that the statistical information shown does not reflect the current situation with messages. It only shows the number of processed messages for the specified time period. At the time of displaying the overview some or all of the messages can be already archived or deleted. Correspondingly, you would not find these messages in the Database tab of the message monitor.
- The time period for the overview always refers to the receipt of the message.
Regards,
Praveen.