Debatching can be done several different ways in BizTalk 2004. With a few message box hops, debatching can be done with a few maps and an envelope schema in pure messaging. This sample shows a map for Sorting, a map for Grouping, and the Envelope for debatching.
This sample will work in BizTalk 2004 and BizTalk 2006.
Get more information from the original blog post on this topic: http://www.biztalkgurus.com/blogs/biztalk/archive/2006/04/03/How-To-Use-BizTalk-Messaging-for-Grouping_2C00_-Sorting_2C00_-and-Debatching.aspx