planned orders clarification

Dear all,

I have two materials A and B.these materials were having strtegy 20.

THe header materials of these A and B are C and D.They are aslo maintained with strategy 20.

Now I have changed the strategy of A and B as 10.

So after creating req for C and D in MD81 I am getting planned orders for A and B. But In the planned order for A I am finding the sales order number and in the planned order for B ,no sales order number is there. I want the planned order for material A also to not have any sales orders associated with. Because while doing MFBF for A , I am getting the error" planned order allowed only for make to order".

Please help me out in this..