Found a nifty little setting in the adf-config.xml file Row Fetch Limit. This applies to all vo's in the application.
Click on the Application resources menu tab and select the adf-config file under ADF META-INF.
Click on the Business Components tab
Ner the bottom there is a Row Fetch Limit checkbox.
Why would I use this:
This setting can be used for performance reasons to set a resultset limit across the entire application.
This can prevent large meaningless user searches with million row results etc.