CWSIT0103E: No messaging engine was found that matched the following parameters: bus=itim_bus, targetGroup=null, targetType=BusMember, targetSignificance=Required, transportChain=InboundSecureMessaging, proximity=Server.

Caused by: com.ibm.websphere.sib.exception.SIResourceException: CWSIT0088E: There are currently no messaging engines in bus itim_bus running. Additional failure information: CWSIT0103E: No messaging engine was found that matched the following parameters: bus=itim_bus, targetGroup=null, targetType=BusMember, targetSignificance=Required, transportChain=InboundSecureMessaging, proximity=Server. 

Solution:- when your ITIM environment will not proceed requests and all the request will be in queued because of this Error, so in this case below steps need to be taken.

1. clean WAS Trans and partner log

2. Restart of DB2, TDS and WAS. 

This solution worked for my customer environment, hope will help yours as well.

Regards

Arvind Kumar