Group By Customer And Item Higher Sale Price?

I'm developing and sql 2008 view that shows me the last month of sales of every customer and every item sold, the problem is that I need group by customer with the higher Sale Price of every item of the customer, example:

1.If We sold the same item to one customer then it must show just the higher sale price of every item

2.If the same item was sold to the same customer at the same price then it must show just the last sold date record of that item

This is I get :

OrderDate |DebNr|DebName|ItemCode|Descript|Qty|CostPrice|SalePrice|
2015-03-05|0001 |Deb0001|Item-001|Item 001| 3 | 223.10 | 289.00 |
2015-02-25|0001 |Deb0001|Item-001|Item 001| 2 | 220.00 | 286.00 |
2015-03-05|0001 |Deb0001|Item-002|Item 002| 1 | 75.00 | 110.00 |
2015-03-02|0002 |Deb0002|Item-001|Item 001| 1 | 218.00 | 265.00 |
2015-02-27|0002 |Deb0002|Item-001|Item 001| 1 | 218.00 | 265.00 |

This is I need :

OrderDate |DebNr|DebName|ItemCode|Descript|Qty|CostPrice|SalePrice|
2015-03-05|0001 |Deb0001|Item-001|Item 001| 3 | 223.10 | 289.00 |
2015-03-05|0001 |Deb0001|Item-002|Item 002| 1 | 75.00 | 110.00 |
2015-03-02|0002 |Deb0002|Item-001|Item 001| 1 | 218.00 | 265.00 |

This is my code :

SELECT TOP (100) PERCENT OrderDate, DebtorNr, DebtorName, ItemCode, Description, Qty, CostPrice, SalePrice
FROM dbo.VK_SALE_ORDERS
WHERE (OrderDate >= DATEADD(MM, - 1, GETDATE()))
ORDER BY DebtorNr, ItemCode