JDEdwards -Change to purchase order updating Blanket Order

Hi everyone,

When creating a purchase order by releasing from blanket order, is it possible to update the blanket order if we manually change quantity on purchase order after it is created.

Example

1- OB with open qty = 100

2- Release 25 on PO --- OB remaining qty = 75

3- Change PO from 25 to 30 --- Desired OB remaining qty = 70

If so, is there special Setup, UDC or Processing Option?

Thanks

Eric