"panisson" wrote : Will the CICS transaction be used in a LastResourceOptimization, or I must transform the local-tx-datasource in a xa-datasource in order to use the CICS transaction globally? | You can have multiple single phase participants in the the global transaction, the TM will complaint about it. You will not be able to go ahead unless you make some AS tweaks, for the LRCO yes you should make oracle ds configured as xa-datasource. Check this http://www.jboss.org/community/wiki/Multiple1PC View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4241102#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...