autonumber template #1: ..
autonumber template #2: <1DIGIT-YEAR><1DIGIT-MONTH>.

The Script

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

-- =============================================
-- Author:		Lucky
-- Create date: October 2008
-- Description:	Create autonumber
-- =============================================
CREATE PROCEDURE [dbo].[sp_create_numbering_row]
	-- Add the parameters for the stored procedure here
	@no VARCHAR(20) = NULL OUTPUT,
	@tablename VARCHAR(100),
	@numberfieldname VARCHAR(100),
	@numberlength INT,
	@initialdigit VARCHAR(3),
	@templatenumber INT

AS
BEGIN
	-- SET NOCOUNT ON added to prevent extra result sets from
	-- interfering with SELECT statements.
	SET NOCOUNT ON;

	-- AUTONUMBERING TEMPLATE #1 ..
	-- AUTONUMBERING TEMPLATE #2 <1YEAR><1MONTH>.

	DECLARE @sql NVARCHAR(MAX);
	DECLARE @result INT;
	DECLARE @next INT;
	DECLARE @nextnumber NVARCHAR(20);
	DECLARE @yearlastdigit VARCHAR(1);
	DECLARE @monthdigit NVARCHAR(2);

	SET @monthdigit=MONTH(GETDATE())
	IF(@monthdigit=10) SET @monthdigit='0'
	ELSE IF(@monthdigit=11) SET @monthdigit='A'
	ELSE IF(@monthdigit=12) SET @monthdigit='B'

	SET @yearlastdigit=(SELECT RIGHT(YEAR(GETDATE()),1))

	IF(@templatenumber=1)
	SET @sql = 'SELECT @result=CAST(RIGHT('+@numberfieldname+','+CAST(@numberlength as NVARCHAR(2))+') AS INT) FROM ['+@tablename+'] WHERE '+@numberfieldname+' LIKE '''+@initialdigit+'.'+@yearlastdigit+'.%''';
	ELSE
	SET @sql = 'SELECT @result=CAST(RIGHT('+@numberfieldname+','+CAST(@numberlength as NVARCHAR(2))+') AS INT) FROM ['+@tablename+'] WHERE '+@numberfieldname+' LIKE '''+@yearlastdigit+@monthdigit+'.%''';

	EXEC sp_executesql @sql,N'@result INT OUTPUT',@result=@result OUTPUT

	IF(ISNULL(@result,0)=0)
	SET @next=1
	ELSE
	SET @next=@result+1

	IF(@templatenumber=1)
	SET @nextnumber=@initialdigit+'.'+@yearlastdigit+'.'+RIGHT(REPLICATE('0',@numberlength)+CAST(@next AS NVARCHAR(20)),@numberlength)
	ELSE
	SET @nextnumber=@yearlastdigit+@monthdigit+'.'+RIGHT(REPLICATE('0',@numberlength)+CAST(@next AS NVARCHAR(20)),@numberlength)

	PRINT @sql
	PRINT @result
	PRINT @next
	PRINT @nextnumber

	SET @sql='INSERT INTO ['+@tablename+'] ('+@numberfieldname+') VALUES ('''+@nextnumber+''')';
	PRINT @sql
	EXEC sp_executesql @sql

	SET @no=@nextnumber
	SELECT @no AS no
END

Parameters

Usage

-- Generate autonumber template #1: ..
exec dbo.sp_create_numbering_row
@tablename='tbl_customer',
@numberfieldname='customer_number',
@numberlength=3,
@initialdigit='CUS',
@templatenumber=1

-- Generate autonumber template #2: <1DIGIT-YEAR><1DIGIT-MONTH>.
exec dbo.sp_create_numbering_row
@tablename='tbl_customer',
@numberfieldname='customer_number',
@numberlength=3,
@initialdigit='',
@templatenumber=2

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