Here is the code that I have so far:
import com.atlassian.jira.component.ComponentAccessor
import org.apache.log4j.Logger;
import org.apache.log4j.Level;
//log.setLevel(Level.DEBUG);
def xMultiSelectPtr = getFieldByName("xx_sfi_apps");
def xMultiSelectVal = xMultiSelectPtr.getValue();
log.info("xMultiSelectVal =====>"+xMultiSelectVal)
//xMultiSelectVal returns something like [1, 3, 6]
// If xMultiSelectVal.size() > 1//{Ask if user meant to choose more than one//}
I am trying to find a way to set the help text if the user chose more than one option.
Any help would be greatly appreciated!!! 
...AnnaG...