SOA, can you please refer good Documents about Correlation Concept
Thanks in Advace
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Please refer to https://community.oracle.com/docs/DOC-889069 .
Well at the highest level check out the Enterprise Integration Patterns - http://www.enterpriseintegrationpatterns.com/patterns/messaging/CorrelationIdentifier.html
Plenty of SOA documentation - you might consider https://docs.oracle.com/cd/E23943_01/dev.1111/e10224/bp_correlate.htm#CHDFHAAE