How can we set back, after an upgrade in Purchase app. Before the update of the app. When there is a Purchase Orders, and a department needs to validate it, so the demand and quantity is default to 0. And this department is the one who will set the quantity delivered.

We have a 20+ and more items purchase orders in one vendor, and they deliver the items partially. 

Now, the new update of Purchase app. The demand and quantity, is automatically same value to every items purchase orders. So we need to change the other items that haven't delivered yet to 0. This gives us a hassle and confusing to the datas.