MS SQL 2005 Identity Lost New Database

Hello

I am creating a TABLE

CREATE TABLE [dbo].[TbTest](
[id_TbTest] [int] IDENTITY(1,1) NOT NULL PRIMARY KEY CLUSTERED ,
[Title] [varchar](100) NULL,
) ON [PRIMARY]


when looking at the Column Properties in MS Server Management Studio I get :
Identity Specification = Yes
(Is Identity) = Yes
Increment = 1
Seed = 1

now if I want to make a copy of that database, importing datas and tables

I get :
Identity Specification = No
(Is Identity) = No

How can I avoid this problem ? my application is not working anymore

ALTER TABLE [dbo].[TbTest] WITH NOCHECK ADD
CONSTRAINT [PK_TbTest] PRIMARY KEY CLUSTERED
(
[id_TbTest]
) ON [PRIMARY]


is not solving that problem

thank you