Purchase Order Receipt and Error Message " Standard Cost Not Setup"

 Hi All,

   I create a Stock Item with "Inventory Cost Level, Sales Price Level, Purchase Price Level " all set to 2. Later i define a Supplier/Item/Branch Price in P41061 and no cost were defined in P4105. During the Purchase Order the unit cost id pulled rightly from P41061 but at the time the receipt Error Message "Standard cost Not setup" error message is generated with the cursor pointing "Unit Cost".

Is this a Valid Error Message as i want the Cost to be pulled only from P41061 but not from P4105? If this is a valid error message, ho wto overcome this aprt from defining the cost in P4105.