Message correlation can be done only using Message Payload properties. The Message Header properties cannot be used for Message correlation purpose.

Constant value cannot be provided for a Correlation property in a Message Subscriber workstep. A Correlation property can be mapped only to a dataslot for a Message Subscriber workstep.

Message Correlation functionality can not be applied for Process Instance creation on receiving a message on BP ServerChannel. For more information, see Process instance creation on a message.