Planning Horizon

Hi,

My Client Requirement is:-

I have a sales order & in that I maintained 5 Line item.

Delivery Dates of sales order line item are- 23.02.2012, 22.03.2012, 23.04.2012, 23.05.2012, 23.06.2012.

Planning Horizon =120 days

Sales Order creation date= 01.01.2012

When system run MRP Background at night , planned order generated for all sales order line item even though sales order 4 & 5 are out of planning horizon.

We Set Processing key NETPL in variant. When I run MRP manually it considered planning horizon period & does not generate planned order for out of planning Horizon. I don't want that 23.05.2012 & 23.06.2012 SO line Planned order.

Where is the problem??

Please gives me Expert Advice very soon....