Is your demultiplier reversing the action of the first CM and merging N input CASes into 1 output CAS? If so then change the ActionAfterCasMultiplier to "drop". This will ensure that the only CAS that continues in the flow is the one output by the demultiplier. Since only the N-th input CAS will generate an output CAS when merging, the default of "dropIfNewCasProduced" will let all but the last split CAS continue in the flow and only the N-th will be dropped when the merged CAS is finally produced.
If I've misunderstood your application please clarify the action of the demultiplier. - Burn.
