MRP RUN for increased qty of SODS PR for complete qty instead of increase

While doing MRP RUN for increased qty of SO No line item 10 to 20,System is making PR for complete qty instead of increased qty.
Sales order  - 0001
Line item - 10 Qty - 10
Line item - 20 Qty - 15
MRP run against the sales order for line item 10 & 20 PR / PO raised for qty 10 & 15 respectively.
After that qty has increased in sales order.Again we run MRP system generates totla no of PR insted of Increased qty .
Sales order  - 0001
Line item - 10 Qty - 10 + 5 = 15
Line item - 20 Qty - 15 + 5 = 20
Plz help

There are few questons here:
- when you increase the amount of the sales order item, is the newly added amount confirmed with the same date / schedule line? You can check the schedule lines for that SO item.
- have the purchase requisitions, which were generated after the first MRP run (before the modification of the SO items), been modified manually (are they firmed?) / processed? In this case MRP cannot modify (delete) them (and create new ones)...
- did you check the MRP control settings in material master
Remark: even if you get several PRs, you can create one PO from them.

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