MDX滤波器&；日期范围问题

尝试完成以下任务：

    WITH SET Customer_CurrentPeriod as
    FILTER (
    [CUSTOMER MASTER].[Cust#].children ,
    (
    [Calendar].[Date].&[20180507]
    , [Item Master].[Sub Group Number].&[100]
    , [Measures].[Ext Price]
    ) > 0
    )

    member Sales_CurrentPeriod as
    sum (
    ([Customer_CurrentPeriod] , [Calendar].[Date].&[20180507])
    , [Measures].[Ext Price]
    ) 

member Sales_Sum_CurentPeriod_Count as [Customer_CurrentPeriod].Count

SELECT
{Sales_CurrentPeriod , Sales_Sum_CurentPeriod_Count} ON COLUMNS
from [SalesDatabase]

• 有多少客户从某一特定产品购买了某一特定产品 日期范围
• 以上提到的任何特定客户的总销售额是多少 日期范围

当前查询： 下面的查询正好提供了我想要的：

    WITH SET Customer_CurrentPeriod as
    FILTER (
    [CUSTOMER MASTER].[Cust#].children ,
    (
    [Calendar].[Date].&[20180507]
    , [Item Master].[Sub Group Number].&[100]
    , [Measures].[Ext Price]
    ) > 0
    )

    member Sales_CurrentPeriod as
    sum (
    ([Customer_CurrentPeriod] , [Calendar].[Date].&[20180507])
    , [Measures].[Ext Price]
    ) 

member Sales_Sum_CurentPeriod_Count as [Customer_CurrentPeriod].Count

SELECT
{Sales_CurrentPeriod , Sales_Sum_CurentPeriod_Count} ON COLUMNS
from [SalesDatabase]

问题

当我尝试将日期更改为日期范围（代码如下所示）时，我收到错误消息。查询（4，6）GreaterThan函数要求1参数使用字符串或数字表达式。使用了元组集表达式

WITH SET Customer_CurrentPeriod as
FILTER (
[CUSTOMER MASTER].[Cust#].children ,
(
{[Calendar].[Date].&[20180507]:[Calendar].[Date].&[20180507]}
, [Item Master].[Sub Group Number].&[100]
, [Measures].[Ext Price]
) > 0
)

member Sales_CurrentPeriod as
sum (
([Customer_CurrentPeriod] , {[Calendar].[Date].&[20180507]:[Calendar].[Date].&[20180507]})
, [Measures].[Ext Price]
)

member Sales_Sum_CurentPeriod_Count as [Customer_CurrentPeriod].Count

SELECT
{Sales_CurrentPeriod , Sales_Sum_CurentPeriod_Count} ON COLUMNS
from [SalesDatabase]

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我显然是MDX新手，所以有人能帮我找出我做错了什么吗？感谢其他有类似问题的人-您需要汇总字段