delivery block in the schedule lines.

Hi,

Mine is a MTO scenario. I am using planning strategy 50. So a planned order ---> production order will be created against MRP run against each sales order.

When i am placing a delivery block at the header the system is working fine. Its deleting the planned order(converted production order).

when I am placing a delivery block at the schedulle line its not working fine. its not deleting the underlined planned order or production order.

what configuration should I do to make this work.......