Good question :)
Which version of JBDS are you using ?
The only trace I've been able to find is https://jira.jboss.org/jira/browse/JBWS-1940 but that is an over a year old fix so should not affect EAP 4.3.
Not sure why EAP would give you this error besides Webservices might be configured differently than in default JBoss AS.
I'll ping WS team to give input.