You can generate number on fly without using identity:
SELECT CONVERT(VARCHAR(6), GETDATE(), 12) + 'GP' +
RIGHT('00000' + CAST(ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS VARCHAR), 5) AS [ImportID]
, *
FROM sys.columns
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"The only true wisdom is in knowing you know nothing"
"O skol'ko nam otkrytiy chudnyh prevnosit microsofta duh!":-D
(So many miracle inventions provided by MS to us...)
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