SqlCeResultSet Looses Updatable Option If Query Has 2 Params

i have result set from such query :

resultSetOptions = System.Data.SqlServerCe.ResultSetOptions.Scrollable | System.Data.SqlServerCe.ResultSetOptions.Updatable;

queryText =
SELECT agvb_id as ID
,agvb_cat_id as Category
,agv_brn_id as Brand
,agvb_brn_name as BrandName
,agv_brn_area as Area
,agv_brn_sku_qty as SkuQuantity
,agv_brn_qty as Quantity
,agv_orderliness as Orderliness
,agvb_importance as Importance
FROM AGENTS_VISITS_BRANDS
WHERE (AGENTS_VISITS_BRANDS.agvb_agv_id = @agv_id)
AND (AGENTS_VISITS_BRANDS.agvb_cat_id = @dad_id)
ORDER BY agvb_brn_name

if i open resultSet with such qury it looses its updatable option.

If i remove from where 1 param (no mater which) everything runs ok.