What is ExceptionList tree structure in IIB?

The exception list tree is a part of the logical message tree in which the message flow writes information about exceptions that occur when a message is processed.

The root of the exception list tree is called ExceptionList, and the tree consists of a set of zero or more exception descriptions. The exception list tree is populated by the message flow if an exception occurs. If no exception conditions occur during message flow processing, the exception list that is associated with that message consists of a root element only. This list is, in effect, an empty list of exceptions.

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