[OpenLayers-Users] Why Filter do not work ?

[Mustafa646]

I used WFS protocol to get feature layer from Geoserver by using code below,
and i successfully got all the features. But when i use filter, then nothing
return. Can anybody explain why this occur ?

 wfs = new OpenLayers.Layer.Vector("States", {
                strategies: [new OpenLayers.Strategy.BBOX()],
                protocol: new OpenLayers.Protocol.WFS({
                    url: "http://localhost:8080/geoserver/wfs",
                    featureType: "traget_grave3",
                    featureNS: "http://www.openplans.org/TestSpace",
                    srsName: "EPSG:900913",
                    version: "1.1.0",
                    isBaseLayer: false,
                    visibility:true
                }),

                filter: new OpenLayers.Filter.Logical({
                    type: OpenLayers.Filter.Logical.AND,
                    filters: [
                        new OpenLayers.Filter.Comparison({
                            type: OpenLayers.Filter.Comparison.EQUAL_TO,
                            property: "GRAV_ID",
                            value: "3 A 1"
                        }),
                        new OpenLayers.Filter.Comparison({
                            type: OpenLayers.Filter.Comparison.EQUAL_TO,
                            property: "GRAV_ID",
                            value: "3 A"
                        })
                    ]
                })
                     
            });

After using filter, nothing return, 
Where is problem ?

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