Displaying Capacity Planning in the Material View 
In the material view you can change the quantity or date of all planned orders.
To do this press the key
Planned orders . You get a dialog box Plnd orders for mat. with a list of all the planned orders.Place the cursor on the desired planned order and press the function key Choose.
The system displays the selected planned order in the screen section "Planned order" with the following fields:
The order quantity, basic finish date and production version can be changed.