PS. If it helps, this is what the tables currently look like -
USE [Tracker]
GO
/****** Object: Table [dbo].[tblLocations] Script Date: 08/27/2012 16:46:34 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[tblLocations](
[Location] [varchar](255) NOT NULL,
[Active] [bit] NOT NULL CONSTRAINT [DF_tblLocations_Active] DEFAULT ((1)),
CONSTRAINT [PK_tblLocations] PRIMARY KEY CLUSTERED
(
[Location] 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
SET ANSI_PADDING OFF
AND...
USE [Tracker]
GO
/****** Object: Table [dbo].[tblContainerMovements] Script Date: 08/27/2012 16:23:52 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[tblContainerMovements](
[MovementID] [int] NOT NULL,
[MovementDate] [datetime] NOT NULL,
[MoveFrom] [varchar](255) NOT NULL,
[MoveTo] [varchar](255) NOT NULL,
[CustomerName] [varchar](64) NOT NULL,
[ContractReference] [varchar](64) NOT NULL,
[TNumber] [varchar](32) NOT NULL,
[NotesAndComments] [text] NULL,
CONSTRAINT [PK_tblContainerMovements] PRIMARY KEY CLUSTERED
(
[MovementID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
ALTER TABLE [dbo].[tblContainerMovements] WITH CHECK ADD CONSTRAINT [FK_tblContainerMovements_tblTNumbers] FOREIGN KEY([TNumber])
REFERENCES [dbo].[tblTNumbers] ([TNumber])
ON UPDATE CASCADE
GO
ALTER TABLE [dbo].[tblContainerMovements] CHECK CONSTRAINT [FK_tblContainerMovements_tblTNumbers]
GO
ALTER TABLE [dbo].[tblContainerMovements] WITH CHECK ADD CONSTRAINT [FK_tblContainerMovements_tblContractReferences] FOREIGN KEY([CustomerName], [ContractReference])
REFERENCES [dbo].[tblContractReferences] ([CustomerName], [ContractReference])
ON UPDATE CASCADE
GO
ALTER TABLE [dbo].[tblContainerMovements] CHECK CONSTRAINT [FK_tblContainerMovements_tblContractReferences]