3397032 - SupplierConfirmedNetPrice not Accepted by API nor via UI using App "Manage Supplier Confirmation"

The field "Confirmed Net Price" is not opened to be edited in the App Manage Supplier Confirmation.

SAP S/4HANA Cloud 

These are the prerequisites for the Net Price opened to be filled:

• SCCUI 101718 "Adopt Price Change" Flag for the Confirmation Category "AB".
• None Supplier confirmation drafts for the same Purchase Order Item.
• None other partial confirmation existing for the same Purchas order item.
• Pricing Schema including at least one price condition Class 'B' and category 'd'.

SSCUi 101278, confirmation net price. , KBA , MM-PUR-GF-CON , Confirmation Control/Shipping Notification , Problem