After coming back in 2018, I started created new purchase orders from the shortfall. The purchase order gets created but then disappears. It doesnt show up in the purchase orders but the products ordered in that Purchase Order, show "Quantity on Order" increased. In the following image, you will notice that the quantity on order is 35 whereas the PO is listed only for 14 pieces. The additional quantities are added up with multiple trials to create a PO. 

Another thing, while creating the PO, it asked that the PO is being created outside of the financial year. It also showed an option to Reminder of this Purchase order in Financial year 2018. Our Financial year till December 2017 is not yet closed.