Hi!
This sounds like a candidate requirement for the DataSource related functionality in soapUI Pro. Are you?
If you are not using soapUI Pro, then groovy scripts will do the trick as well (a bit more work though..). Have a look at the template-data data scenario to get the idea:
http://www.soapui.org/userguide/scenarios/templatedriven.htmlHope this helps!
regards,
/Ole
eviware.com