D2W newbie question

Hi all,

I try a simple thing with D2W and doesnot seem to work :
On a query page of my entity, I had a simple query on the name (String) using D2WQueryStringOperator but this is not taken into 
account.
The select generated by EOF has no clause and the whole table is retrived.
Am I doing something wrong ?
Thanks for you help.
Pierre

The rule :

{
   "class" = "com.webobjects.directtoweb.Rule";
   "author" = "100";
   "rhs" = {
    "class" = "com.webobjects.directtoweb.Assignment";
    "value" = "Nom Local";
    "keyPath" = "displayNameForProperty";
   };
   "lhs" = {
    "class" = "com.webobjects.eocontrol.EOAndQualifier";
    "qualifiers" = (
     {
      "class" = "com.webobjects.eocontrol.EOKeyValueQualifier";
      "value" = "query";
      "selectorName" = "isEqualTo";
      "key" = "task";
     },
     {
      "class" = "com.webobjects.eocontrol.EOKeyValueQualifier";
      "value" = "SubstanceActive";
      "selectorName" = "isEqualTo";
      "key" = "entity.name";
     },
     {
      "class" = "com.webobjects.eocontrol.EOKeyValueQualifier";
      "value" = "nomLocal";
      "selectorName" = "isEqualTo";
      "key" = "propertyKey";
     }
    );
   };
  }