You can configure cluster-wide transaction recovery of distributed transactions across all the ITMs of a cluster by selecting Enable Cluster-Wide Recovery in the Cluster: Configuration: JTA page in the WebLogic Server Administration Console.
When cluster-wide recovery is enabled, each ITM in a WebLogic Server cluster is aware of the transaction distribution across the entire cluster. This allows the ITM on each cluster member to determine whether it should handle a given XA call or forward it to the appropriate ITM on another cluster member.
For more information about WebLogic Server transaction processing, see Understanding Failure Management and Participating in Transactions Managed by a Third-Party Transaction Manager in Developing JTA Applications for Oracle WebLogic Server.