executing a function without input parameter

Hi all...

I am having problems executing a function which does not have a input  
parameter.  I am getting the following error: EvaluateExpression  
failed: <com.webobjects.jdbcadaptor.OraclePlugIn$OracleExpression:  
"{ ? = call F_REQUESTSESSIONID}" withBindings:  
1:<com.webobjects.foundation.NSKeyValueCoding$Null>(returnValue)>:


My code looks like this.
  Instead of null argument I also tried with empty NSMutableDictionary.


public Number generateSessid(){
	NSDictionary outlist;
	Number	outNumber=null;
	//NSMutableDictionary dict = new NSMutableDictionary();
	try {
		outlist=  EOUtilities.executeStoredProcedureNamed(getEC(),  
"fRequestsessionid", null);
		outNumber= (Number)outlist.objectForKey("returnValue");
		}catch (Exception e) {
		getSession().leggTilFeilmelding("Feil ved kjøring av  
databaseprosedyr pRequestsessionid !");
			logger.warn("Feil ved kjøring av databaseprosedyre  
pRequestsessionid:" + e);
		}
		return outNumber;
	}

Any help would be appreciated...
regards
Yamuna