Cascade Issue

I have 2 tables A and Table B respectively:

Table A:

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = 
OBJECT_ID(N'[dbo].[aa]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[aa](
	[aa1] [int] NOT NULL,
	[aa2] [int] NULL,
	[aa3] [int] NULL,
 CONSTRAINT [PK_aa] PRIMARY KEY CLUSTERED 
(
	[aa1] ASC
)WITH (PAD_INDEX  = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END


Table B:

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = 
OBJECT_ID(N'[dbo].[bb]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[bb](
	[bb1] [int] NOT NULL,
	[bb2] [int] NOT NULL,
	[bb3] [int] NOT NULL,
 CONSTRAINT [PK_bb] PRIMARY KEY CLUSTERED 
(
	[bb1] ASC
)WITH (PAD_INDEX  = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO



IF NOT EXISTS (SELECT * FROM sys.foreign_keys WHERE object_id = 
OBJECT_ID(N'[dbo].[FK_bb_aa]') AND parent_object_id = 
OBJECT_ID(N'[dbo].[bb]'))
ALTER TABLE [dbo].[bb]  WITH CHECK ADD  CONSTRAINT [FK_bb_aa] FOREIGN 
KEY([bb2])
REFERENCES [dbo].[aa] ([aa1])
ON UPDATE CASCADE
ON DELETE CASCADE
GO
ALTER TABLE [dbo].[bb] CHECK CONSTRAINT [FK_bb_aa]


 

IF NOT EXISTS (SELECT * FROM SYS.FOREIGN_KEYS WHERE OBJECT_ID = 
OBJECT_ID(N'[DBO].[FK_BB_AA1]') AND PARENT_OBJECT_ID = 
OBJECT_ID(N'[DBO].[BB]'))
ALTER TABLE [DBO].[BB]  WITH CHECK ADD  CONSTRAINT [FK_BB_AA1] FOREIGN 
KEY([BB3])
REFERENCES [DBO].[AA] ([AA1])
ON UPDATE CASCADE
ON DELETE CASCADE
GO
ALTER TABLE [DBO].[BB] CHECK CONSTRAINT [FK_BB_AA1]

creating FK_BB_AA1 fails with the following error:

Msg 1785, Level 16, State 0, Line 3
Introducing FOREIGN KEY constraint 'FK_bb_aa1' on table 'bb' may cause 
cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO 
ACTION, or modify other FOREIGN KEY constraints.
Msg 1750, Level 16, State 0, Line 3
Could not create constraint. See previous errors.
Msg 4917, Level 16, State 0, Line 1
Constraint 'FK_bb_aa1' does not exist.
Msg 4916, Level 16, State 0, Line 1
Could not enable or disable the constraint. See previous errors.



How to get this working.