PROBLEM WITH DBCC CHECKIDENT

Hello,
I'm working with SQLSERVER 2008 R2, and I need use the DBCC CHECKIDENT for reseed an identity field

DBCC CHECKIDENT(@TabbleName, RESEED, @newSeedValue); 

This statement does not give any result when the reference table has been never used. 

EXAMPLE: 

DBCC CHECKIDENT('Tabella1', RESEED, 1000); 

Result:Checking identity information: current identity value 'NULL', current column value '1000 '. 
etc..

But in truth, the statement is not effective. 

anyone can help me please?
Thank you very much

Roberto Tomassini