Attribute Assertion Processor – Ensures that specified transaction attributes have values.
Select the Processor Configuration tab and click on Add Processor.
Select the Attribute Assertion Processor from the drop-down.
In the Basic tab you can set:
Required Attributes: A table of the attributes which are required. Values may be blank to indicate that the attribute must exist but can be set to any value.
Document must be XML: Ensures that the document parses as valid XML.