Process Message Checks 
Checks
Before a process message is sent to its destinations, the system checks:
Whether the message matches the message category defined in Customizing for the SAP system
Whether the destinations that are assigned to a message exist
For all destinations except external functions, whether a message can be processed by its destinations
Which processing type has been specified in Customizing for the message category for messages with a destination error (see Further Message Processing below).
Documentation of Results
The results of the checks are documented as follows:
The message status is updated.
Information, warning, and error messages are written to the message log.
The processing type is documented in the message log.
See also:
Information about the message status under Display of Process Message Lists
Further Message Processing
Depending on the results of the checks, the message is further processed as follows:
Messages without errors are sent to their destinations.
Messages with destination errors (Status To be resubmitted or Destination error ) are treated differently depending on the Customizing settings you have made for the message category. You can choose between the following processing types:
Send to all destinations that can process the message
In this case, the message is sent to all destinations that can process it even if an error occurred at another destination.
Once the message has been sent to a destination, it can no longer be changed in the message monitor even if it cannot be processed by a destination due to incorrect message data.
Send to all destinations or not at all
In this case, the message is not sent to any destination if an error occurred at one destination at least. Thus, you can correct the message in the message monitor and then send it to all destinations.
See also: