If a server program issues the IMS™ ROLB call, all database changes are reversed, and all output messages are erased from the IMS message queue. However, the client is not automatically notified of this action and will (when the transaction completes normally) receive a CSMOKY message, indicating normal completion.

As a result, for transactions that conditionally issue the ROLB call, the server should send a message to the client indicating whether the ROLB command was issued. Otherwise, the client might incorrectly interpret the CSMOKY message to mean that database changes have been made (when in fact, the message simply denotes successful termination of the transaction).