All you have to do is join the tables together to be:
Make sure you change the * to be the columns you need for your code. it is bad practice to select all the columns.
USE [ShopDatabase]
GO
/****** Object: StoredProcedure [dbo].[stpGet_StockUnitDetails] Script Date: 09/17/2013 12:03:05 ******/
SET ANSI_NULLS OFF
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROC [dbo].[stpGet_StockUnitDetails]
@strStockUnitCode nvarchar(250)
As
SELECT
* -- change this to be the columns your code needs
from VIEWSTOCKUNIT a
inner join STOCK_DESCRIPTORS b on a.strStockUnitCode = b.strStockUnitCode
Where a.strStockUnitCode = @strStockUnitCode