update [RegistryCopy].[dbo].[RegFile_New]
SET r.[FileNo] = v.[Cont#Account (New ACC)]
where r.[FileNo] IN
    (
    SELECT r.[FileNo]
    FROM [RegistryCopy].[dbo].[RegFile_New] as R
    INNER JOIN
    [Registry_Malta_Recovered].[dbo].OLD_NEW_AccountsFromSap as v ON 
     r.FileNo] = v.[Acct in legacy (Old ACC)]
      where 
      r.[FileNo] = ('1000040000')
     )
I'm getting the error message:
The multi-part identifier "r.FileNo" could not be bound.
 
     
     
     
     
    