Specifies the XPath expression, JMS property, or system value that contains the txid used to uniquely identify transactions. This overrides any txid defined in parent transaction rules and is required if there is no parent transaction rule. The value must be incremented for each transaction.

oprule.txid={xpath_expression|$jms_property|*txid}

For most cases using the system value of *txid is preferred.

For example:

dynoprule.txid=$JMSTxId
dynoprule.txid=*txid