Hi all,
Quick update: apparently, I misread the doc. 
In version 6.0.1 and below, the UUID does not exist at publish. To cope with this, the UUID is set to the value of the trackid(or eventid in the absence of trackid).
But as of 6.1, the UUID exists and hence it is impossible to set it. It gets managed internally.
… Which is logical, since the document history functionality is intentend for technical hicups (IS-broker connection pblms) and not for functional validation.
Anyway thanks for the help RMG
Cheers,
Loic
#broker#webMethods#Integration-Server-and-ESB#Universal-Messaging-Broker