OSB and resequencing of JMS messages

the feature exists in ESB:
http://download.oracle.com/docs/cd/E12524_01/doc.1013/e12638/sequencer.htm

you can use Unit Of Order instead:
http://download.oracle.com/docs/cd/E12840_01/wls/docs103/jms/uoo.html

see this extensive dissertation:
http://forums.oracle.com/forums/thread.jspa?threadID=2136854&tstart=165
(the post from 816687 )