Bug in XmlFilteringMessageSpliter?

Hio,
I had strange issue in aggregating responses after an XML message was split into several messages.
I always had the warning that event group expected size was -1.

So debugging a little a found that during the XmlSplit task messege.setCorrelationGroupSize was never called.

I tried adding message.setCorrelationGroupSize(foundNodes.size()); in the initialise(UMOMessage message) method of FilteringXmlMessageSplitter and now responses are correcly aggregated.
Is this a bug? I'm using mule 1.4.4 snapshot


thanks
Davide.