Invalid field error

I have the query below throwing an error about AMS_Ref being an invalid column name. Can anyone shed some light on this please?

Thanx as always for any advice.
SELECT     RIGHT('00' + CAST(a.ARCD11 AS varchar(2)), 2) + '-' + RIGHT('00000' + CAST(a.RCNO11 AS varchar(5)), 5) AS AMS_Ref , b.CustomerNumber
FROM         dbo.SON_Archive4Sentinel_PTP11 AS a LEFT OUTER JOIN
                      ANCHORSERV.S3CUSTDB.dbo.CustomerTable AS b ON SUBSTRING(AMS_Ref, 1, 8) = b.CustomerNumber
WHERE     (a.EVNO11 = 50)

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Steven O'NeillSolutions ArchitectAsked:
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Raja Jegan RConnect With a Mentor SQL Server DBA & ArchitectCommented:
Hope this helps
SELECT RIGHT('00' + CAST(a.ARCD11 AS varchar(2)), 2) + '-' + RIGHT('00000' + CAST(a.RCNO11 AS varchar(5)), 5) AS AMS_Ref , b.CustomerNumber
FROM dbo.SON_Archive4Sentinel_PTP11 AS a 
LEFT OUTER JOIN ANCHORSERV.S3CUSTDB.dbo.CustomerTable AS b ON SUBSTRING(RIGHT('00' + CAST(a.ARCD11 AS varchar(2)), 2) + '-' + RIGHT('00000' + CAST(a.RCNO11 AS varchar(5)), 5), 1, 8) = b.CustomerNumber
WHERE     (a.EVNO11 = 50)

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Aneesh RetnakaranConnect With a Mentor Database AdministratorCommented:
SELECT     RIGHT('00' + CAST(a.ARCD11 AS varchar(2)), 2) + '-' + RIGHT('00000' + CAST(a.RCNO11 AS varchar(5)), 5) AS AMS_Ref , b.CustomerNumber
FROM         dbo.SON_Archive4Sentinel_PTP11 AS a
LEFT OUTER JOIN  ANCHORSERV.S3CUSTDB.dbo.CustomerTable AS b ON SUBSTRING(RIGHT('00000' + CAST(a.RCNO11 AS varchar(5)), 5), 1, 8) = b.CustomerNumber
WHERE     (a.EVNO11 = 50)
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RiteshShahCommented:
try this.

SELECT     RIGHT('00' + CAST(a.ARCD11 AS varchar(2)), 2) + '-' + RIGHT('00000' + CAST(a.RCNO11 AS varchar(5)), 5) AS AMS_Ref , b.CustomerNumber
FROM         dbo.SON_Archive4Sentinel_PTP11 AS a LEFT OUTER JOIN
                      ANCHORSERV.S3CUSTDB.dbo.CustomerTable AS b ON SUBSTRING(a.AMS_Ref, 1, 8) = b.CustomerNumber
WHERE     (a.EVNO11 = 50)
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Steven O'NeillSolutions ArchitectAuthor Commented:
Thanx again for this guys, thought I could use the ASM_Ref within the FROM condition but obviously couldn't do this. Have given some points to @aneeshattingal as you were on the right track but the query wasn't complete (missing the first part of the SELECT query whilst within the FROM Condition) and @rrjegan17 had the complete query. Thanx again to all.
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