SMQ2: SYSFAIL Comparison error during the execution of a simple

Question

Hi folks, I have an operation mapping interface determination with exactly 1 target message of occurence 0..1, that means the mapping output can be nothing for some input messages, that means a target message is not produced so that the output looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<Messages><Message1/></Messages>
In services builder the test finishes successfully when no output message is produced. Also in integration builder i can test the configuration and it works without errors.
But in runtime the message status is set to "Recorded for Outbound Processing" in SXI_MONITOR and the queue status of the message to "Message has errors". The message stops in SMQ2 with "SYSFAIL" as status and statusText "Comparison error during the execution of a simple" (truncated).
Anybody experienced the same? How has the output of an operation mapping to look like when no target message is produced?
I also tested with an output like this when no target is produced, but this results in System error "Split mapping created no messages" in SXI_MONITOR:
<?xml version="1.0" encoding="UTF-8"?>
<ns0:Messages xmlns:ns0="http://sap.com/xi/XI/SplitAndMerge">
<ns0:Message1></ns0:Message1></ns0:Messages>
Thanks for your help, best regards, Martin

Answer 1

You seem to be having a multi-mapping involved.
The operation mapping has to produce at least the start and end tag.....even if the entire message is not present
Ex:
<SRC>
<First>
<Middle>
<Last>
</SRC>
If above is the structure, then it should be ensured that at least <SRC></SRC> is created by your mapping program....however in your case this is not happening....the tags that you see Messages and Message1 are due to the multi-mapping program and your message should be more than this.
if you say that occurence is 0..1 then what you can do is map this 0..1 node (root) with at least a blank Constant.
Unless you create a message (even though empty) you will continue to receive the error message.
Regards,
Abhishek.