无法在SQL Server中执行分组依据

需要唯一具有最大BookingVersion 分组依据的行 shipmentNumber, shipmentDate,

elect max(BookingVersion) BookingVersion, flightId, shipmentNumber, shipmentDate, FlightOffPoint, IIF(BookingStatusCode = 'XX', 'XX','SS') BookingStatusCode
from Exp_BookingDelta where flightid='625436' 
group by flightId, shipmentNumber, shipmentDate, FlightOffPoint, BookingStatusCode  
order by max(BookingVersion) desc

谁能解释我所缺少的吗？

当前结果：

BookingVersion  flightId    shipmentNumber  shipmentDate    FlightOffPoint  BookingStatusCode
4               625436      61823647238     2019-12-04      LHR             XX
2               625436      61823647238     2019-12-04      LHR             SS
1               625436      61826374895     2019-12-06      LHR             XX
0               625436      61825364780     2019-11-26      LHR             SS
0               625436      61825364791     2019-11-26      LHR             SS
0               625436      61825364802     2019-11-26      LHR             SS
0               625436      61826374895     2019-12-06      LHR             SS

预期结果：

BookingVersion  flightId    shipmentNumber  shipmentDate    FlightOffPoint  BookingStatusCode
4               625436      61823647238     2019-12-04      LHR             XX
1               625436      61826374895     2019-12-06      LHR             XX
0               625436      61825364780     2019-11-26      LHR             SS
0               625436      61825364791     2019-11-26      LHR             SS
0               625436      61825364802     2019-11-26      LHR             SS