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How are you passing message to B2B? If you are passing message to B2B from SOA composite then in the particular component (Mediator/BPEL) you need to make sure to assign unique value to message id header. If you are passing message to B2B using file system (B2B has been configured with file listening channel) then make sure to rename the file every time to assign the unique value in message id part of file name.
To generate unique id always use the following BPEL XPATH Extension function