IndReq Consumption

Dear All,

I have a Sales Order created and in the Requirements Type settings I've chosen "Sales From Stock" and "Requirements not planned but displayed".

Example: SO quantity 30 TON

MD61 (Demand Management). I've created requiredments for 30 TON

Now, once I run MRP it creates a PLND Order for the IndReq and doesn't do anything for the CustReq which is what I want. However, once I finish the production order and do a delivery to the Sales Order, the IndReq continues to be there and the Stock is 0, I run MRP again it generates another Planned Order.

How can the Customer Requirements Consume from the Independant Requirements?