Truncate does not fail for me...?

CREATE TABLE [dbo].[CustomerMaster](

[CustomerId] [int] IDENTITY(1,1) NOT NULL,

[CustomerCode] [varchar](30),

[CustomerName] [varchar](200),

[CreatedDate] [datetime],

[ContactNo] [varchar](20)

CONSTRAINT [PK_CustomerId] PRIMARY KEY CLUSTERED

(

[CustomerId] ASC

)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

) ON [PRIMARY]

GO

CREATE TABLE [dbo].[CustomerDocuments](

[DocAttachmentId] [int] IDENTITY(1,1) NOT NULL,

[CustomerId] [int] NOT NULL,

[DocumentType] [varchar](5),

[DocumentName] [varchar](200) NULL,

CONSTRAINT [PK_CustomerDocs] PRIMARY KEY CLUSTERED

(

[DocAttachmentId] ASC

)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

) ON [PRIMARY]

insert into [CustomerMaster] (CustomerCode, customerName, CreatedDate, ContactNo)

values ('ABC','ABC','1/1/10','0000000')

insert into CustomerDocuments (CustomerID, DocumentType, DocumentName)

values ('1','123','123')

insert into CustomerDocuments (CustomerID, DocumentType, DocumentName)

values ('1','456','456')

select * from CustomerDocuments

select * from CustomerMaster

TRUNCATE TABLE CustomerDocuments

TRUNCATE TABLE CustomerMaster

SELECT IDENT_CURRENT( 'CustomerMaster' )

drop table CustomerDocuments

drop table CustomerMaster