Transaction Attribute Population Processor – Populates transaction attributes with a value.
Populates a single transaction attribute with the results of a general expression, which can be a literal value, environmental variable, or OGNL expression.
Select the Processor Configuration tab and click on Add Processor.
In the Basic tab you can set the Transaction Attribute Name, Evaluation Expression and Attribute Scope (it can be Transaction or Process).
In the Conditional Execution tab you can set additional processor execution conditions. The Transaction data dependent condition may be specified here as enhanced expression. If this expression returns anything other than TRUE (ignore case) – this processor will be skipped.