Nested CASE statement with aggregate function

I am looking for a way to make the following select statement work.  The problem is that I cannot use the field invno because I get the following error "is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause"  Is there any other way to write this?

The first select state works fine.  However, in this case I need to look at the first character of the invno to determine the company and that will then be the first part of getting the LEVEL.

This works perfectly
 
select Specno + '-' + spcompany + ' / ' + Project + ' / ' + spcontact as Order1, Count(*) as OrderCount, 
SUM(QtyShp) AS TotQty, Level=
CASE
	   	WHEN SUM(QtyShp) < 250 THEN 'A'
           	WHEN SUM(QtyShp) < 500 THEN 'B'
	   	WHEN SUM(QtyShp) < 1000 THEN 'C'
	   	WHEN SUM(QtyShp) < 5000 THEN 'D'
	   	WHEN SUM(QtyShp) < 10000 THEN 'E'
	   	ELSE 'F'
	   END 
From SBTInvoice 
where salesmn = 'aparker' 
Group by Specno + '-' + spcompany + ' / ' + Project + ' / ' + spcontact
 
 
This is the statement I want to work but it does not.
 
 
select Specno + '-' + spcompany + ' / ' + Project + ' / ' + spcontact as Order1, Count(*) as OrderCount, 
SUM(QtyShp) AS TotQty, Level=
CASE
	WHEN LEFT(invno,1) = '1' OR LEFT(invno,1) = '2' THEN
	   CASE  	
	   	WHEN SUM(QtyShp) < 250 THEN 'A'
           	WHEN SUM(QtyShp) < 500 THEN 'B'
	   	WHEN SUM(QtyShp) < 1000 THEN 'C'
	   	WHEN SUM(QtyShp) < 5000 THEN 'D'
	   	WHEN SUM(QtyShp) < 10000 THEN 'E'
	   	ELSE 'F'
	   END 
        ELSE
	   CASE  	
		WHEN SUM(QtyShp) < 25 THEN 'A'
		WHEN SUM(QtyShp) < 50 THEN 'B'
		WHEN SUM(QtyShp) < 100 THEN 'C'
		WHEN SUM(QtyShp) < 500 THEN 'D'
		WHEN SUM(QtyShp) < 1000 THEN 'E'
		ELSE 'F'
	   END 
     END 
From SBTInvoice 
where salesmn = 'aparker' 
Group by Specno + '-' + spcompany + ' / ' + Project + ' / ' + spcontact

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twestfallAsked:
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WoodzCommented:
The problem is that you want to use the INVNO field as part of the selection expression, which operates on the result of the table query. The table query is not returning the INVNO field, as it is hidden by the group by clause. To resolve this, you want to have the INVNO field available to the selection expression, which means that it needs to be returned by the group by expression. Simply add ", invno" to the end of the group by expression.
select Specno + '-' + spcompany + ' / ' + Project + ' / ' + spcontact as Order1, Count(*) as OrderCount, 
SUM(QtyShp) AS TotQty, Level=
CASE
        WHEN LEFT(invno,1) = '1' OR LEFT(invno,1) = '2' THEN
           CASE         
                WHEN SUM(QtyShp) < 250 THEN 'A'
                WHEN SUM(QtyShp) < 500 THEN 'B'
                WHEN SUM(QtyShp) < 1000 THEN 'C'
                WHEN SUM(QtyShp) < 5000 THEN 'D'
                WHEN SUM(QtyShp) < 10000 THEN 'E'
                ELSE 'F'
           END 
        ELSE
           CASE         
                WHEN SUM(QtyShp) < 25 THEN 'A'
                WHEN SUM(QtyShp) < 50 THEN 'B'
                WHEN SUM(QtyShp) < 100 THEN 'C'
                WHEN SUM(QtyShp) < 500 THEN 'D'
                WHEN SUM(QtyShp) < 1000 THEN 'E'
                ELSE 'F'
           END 
     END 
From SBTInvoice 
where salesmn = 'aparker' 
Group by Specno + '-' + spcompany + ' / ' + Project + ' / ' + spcontact, invno

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MikeTooleCommented:
Split the second query into two Select statements with a where clause to distinguish between the two sets of data, and use a JOIN to concatenate the two results.
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awking00Information Technology SpecialistCommented:
CASE
      WHEN (LEFT(invno,1) IN ('1','2') AND SUM(QtyShp) < 250)
          OR (LEFT(invno,1) > '2' AND SUM(QtyShp) < 25) THEN 'A'
            WHEN (LEFT(invno,1) IN ('1','2') AND SUM(QtyShp) < 500)
          OR (LEFT(invno,1) > '2' AND SUM(QtyShp) < 50) THEN 'B'
      WHEN (LEFT(invno,1) IN ('1','2') AND SUM(QtyShp) < 1000)
          OR (LEFT(invno,1) > '2' AND SUM(QtyShp) < 100) THEN 'C'
      WHEN (LEFT(invno,1) IN ('1','2') AND SUM(QtyShp) < 5000)
          OR (LEFT(invno,1) > '2' AND SUM(QtyShp) < 500) THEN 'D'
      WHEN (LEFT(invno,1) IN ('1','2') AND SUM(QtyShp) < 10000)
          OR (LEFT(invno,1) > '2' AND SUM(QtyShp) < 1000) THEN 'E'
      ELSE 'F'
END
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twestfallAuthor Commented:
I changed invno in the group by to left(invno,1) and it worked perfectly.  
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