The severity (element SeverityCode) distinguishes between errors in the following ways:
Information (SeverityCode = 1)
Contains general information displayed by the interface.
Warning (SeverityCode = 2)
Describes an error where the requested operation could be performed on an object, but the object could not be defined completely.
Example
A receiver agreement was set up without a receiver communication channel being assigned.
Error (SeverityCode = 3)
Describes an error where the requested operation could not be performed on an object.
Example
An object cannot be created or changed because the object key was not entered completely.
Termination (SeverityCode = 4)
Describes a runtime failure when calling the Web Service. When a termination occurs the transaction is rolled back.