Each GROUP BY expression must contain at least one column that is not an outer reference

Hello,
I need help understanding why the following code fails with an error message of
Msg 164, Level 15, State 1, Procedure spDistributionTableSupportTeamInsert, Line 6
Each GROUP BY expression must contain at least one column that is not an outer reference.
I did fix it after doing some research by removing @TASKORDER from the group by clause - so it is now working fine.  However, I'd like to learn why its inclusion in the group by clause caused the code to fail.  

CREATE PROCEDURE spDistributionTableSupportTeamInsert
@TASKORDER  nvarchar(50)
AS

INSERT INTO Distribution
(TaskOrder,Name, LName, OBS, Department, [Function], InitialPostedDate, LastPostedDate, 
 EligibilityStatus, [Description], Contribution, DistributionAmt)

SELECT   @TASKORDER  , [Name], [LName], [OBS], [Department], [Function], Min([MinOfInitialPostedDate]), 
		 Max([MaxOfLastPostedDate]), [EligibilityStatus], [Description],  [Contribution], 
		 [DistributionAmt] FROM vwRolledUpSupportTeam WHERE [TaskOrder] <> @TASKORDER		 
		 AND [Name] NOT IN (SELECT [Name] FROM vwShareAllocation WHERE [TaskOrder] = @TASKORDER)
         GROUP BY @TASKORDER, [Name], [LName], [OBS], [Department], [Function], [EligibilityStatus], 
         [Description],  [Contribution], [DistributionAmt]

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chtullu135Asked:
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HainKurtConnect With a Mentor Sr. System AnalystCommented:
You can group by only fields or expression containing some column
and there is no reason adding some fixed value to grouping, just it does not make any sense... just add that value to select part...
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Shaun KlineLead Software EngineerCommented:
Try giving your @TASKORDER field in the SELECT clause a name, and then use that name in place of @TASKORDER in the GROUP BY. My guess is that the GROUP BY does not like variables.
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HainKurtSr. System AnalystCommented:
try this:

ie, no need to add parameter to group since it is fixed...
SELECT   @TASKORDER  , [Name], [LName], [OBS], [Department], [Function], Min([MinOfInitialPostedDate]), 
		 Max([MaxOfLastPostedDate]), [EligibilityStatus], [Description],  [Contribution], 
		 [DistributionAmt] FROM vwRolledUpSupportTeam WHERE [TaskOrder] <> @TASKORDER		 
		 AND [Name] NOT IN (SELECT [Name] FROM vwShareAllocation WHERE [TaskOrder] = @TASKORDER)
         GROUP BY [Name], [LName], [OBS], [Department], [Function], [EligibilityStatus], 
         [Description],  [Contribution], [DistributionAmt]

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chtullu135Author Commented:
HainKurt

I did what you suggested before I posted the question and it worked.  I wanted to know the reason why it worked.  

Shaun_Kline:

I agree that the group by doesn't like variables.  I'm trying to understand why
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