Accessing runtime constants with XSLT doesn't work

Hi PI-experts,
I'm trying to insert the Message ID from my message in a XSLT Mapping. I followed the description in SAP Help:
First declare a param:
<xsl:param name="MessageId"/>
Later, use it:
<MESSAGE_ID><xsl:value-of select="$MessageId"/></MESSAGE_ID>
But the field MESSAGE_ID is always empty.
Any explanations ?
What do I need to do, to make it work ?

Hi Udo and all,
i have a bpm, where i first collect some messages and then execute a transformation step, which calls a XSLT Mapping to merge multiple messages into one. After this Transformation Step i added another Transformation Step, which calls a Message Mapping. This Message Mapping is a one to one mapping (every field in the source gets mapped to its twin in the target structure, both messages are the same). Only one field is changed, i wrote user-defined function as proposed in Michal's blog, retrieve the MessageID and set it to this field. I tested the BPM and it definitly works, the Message ID is set to the correct value.
Is this a different behaviour than you have experienced in the past?
I'm running on PI 7.0 with SP 16.
Best Regards
Sven

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As far as I know you cannot access Runtime constants if there is a message split.
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