Operators with Local variable in Dynamic Sql Query

DECLARE @PFactor NUMERIC

SELECT @PFactor=MonPfactor FROM dbo.CbzCurMst WITH(NOLOCK) WHERE CurType='INR'

SELECT      Vw.PrdVarCode AS [SKU],
            (SELECT CASE WHEN Sale=0 THEN Price*@PFactor
                            ELSE Sale*@PFactor
                     END ) AS [Price],....

DECLARE @PFactor NUMERIC
    SELECT @PFactor=MonPfactor FROM CbzCurMst WHERE CurType=''INR''
    SELECT      Vw.PrdVarCode AS [SKU],


        (SELECT CASE WHEN Sale =0 THEN Price * @PFactor ELSE Sale*@PFactor END ) AS [Price]