Restrict the list of values retrieved by a model driven LOV

hi all
i'm try to restrict the list of values retrieved by a model driven LOV just like the article in this link
http://www.oracle.com/technology/products/jdev/tips/fnimphius/restrictlovlist/restrictlov.html
and i'm using the jdev11.2 but i always get this error
java.sql.SQLException: parameter IN or OUT is missing at index 1
my code is :
public void SetSchoolLovVar(LaunchPopupEvent launchPopupEvent)
String var_val=getOt7().getValue().toString();
System.out.println("++++++++++++++++++++++++++++++++"+var_val);
BindingContext bctx = BindingContext.getCurrent();
BindingContainer bindings = bctx.getCurrentBindingsEntry();
FacesCtrlLOVBinding lov = (FacesCtrlLOVBinding)bindings.get("DeptCode");
System.out.print("LOVE "+lov);
System.out.println("+_+_+_+_+__+_+_+__+_+_+_+_+_+_+_+_+_+_________+++++_+_+_"+lov.getName());
lov.getListIterBinding().getViewObject().setNamedWhereClauseParam("Rejon_For_Prj_Dept",var_val);
Rejon_For_Prj_Dept is the bind variable of the Lov Query.
any good idea

Hi,
The error might be due to making the bind variable as required but not using it in the vo query. Edit the bind variable and make it as optional by unchecking the required checkbox.
Sireesha

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