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.