Good day all, 

Reaching out to find out if there are any smart people who can assist with a possible solution / parameter regarding the following scenario. The process is as follows:

1. PR (purchase request) is created with a QTY of 10 units and submitted  for approval via workflow. 
2. PR is fully approved and PO (purchase order)  for 10 units is generated, closing the  PR.
3. The PO line is modified, reducing the QTY of 10 to 5 units on the PO and saved. 
4. Because the PO QTY is 5 units and is less than the PR QTY of 10, the PR re-opens.
5. The re-opened PR allows users to generate another order for the remaining QTY of 5 units on a different order NR.
6. The requirement is thus that the PR does not allow users to re-order despite the QTY being less on the order. 

I would like to know if there is a standard solution to prevent PRs from reopening to be ordered again, either a parameter or an entry transaction setup somewhere to prevent users from generating PO's again. Perhaps its as simple as a user security setting or user parameter. I'm hoping someone can provide some insights on how we can manage this.