Dynamics ax 2012 get real std cost

get real std cost

public static server InventItemPrice TEK_find(
    ItemId                  _itemId,
    InventSiteId            _InventSiteId   = "",
    boolean                 _forUpdate      = false,
    // #! for TEK_ProdSTDvsActCost report 
    date                    _date           = today()
    )
{
    InventItemPrice     inventItemPrice;
    InventDim           InventDim;
    if (_InventSiteId)
    {
        select firstonly inventItemPrice
            order by ActivationDate desc, CreatedDateTime desc
            where inventItemPrice.ItemId                == _itemId
                && inventItemPrice.PriceType            == CostingVersionPriceType::Cost
                && inventItemPrice.ActivationDate       <= _date
            join InventDim
                where InventDim.inventDimId == inventItemPrice.InventDimId
                    && InventDim.InventSiteId == _InventSiteId;
    }    else
    {        select firstonly inventItemPrice
            order by ActivationDate desc, CreatedDateTime desc
            where inventItemPrice.ItemId                == _itemId
                && inventItemPrice.PriceType            == CostingVersionPriceType::Cost
                && inventItemPrice.ActivationDate       <= _date
                ;
    }    return inventItemPrice;
}