3379607 - App Process Purchase Requisitions V2 Create Purchase Order TAB not active

A user has created a Purchase requisition and goes to the App Process Purchase Requisitions (V2) to create a follow on Purchase Order 
however the 'Create Purchase Order' TAB is not active and they cannot proceed. 

SAP S/4HANA Cloud

1. Create a Purchase Requisition in the manage purchase requisitions professional APP
2. Go to the App Process Purchase Requisitions (V2) and find the PR
3. Select the Line
4. The option to create a PR is not available 

In the new Process Purchase Requisitions App a fixed supplier is mandatory to start the Purchase Order process.

Note ** Stock Transfer Purchase Requisitions created by MRP or otherwise, cannot be processed in this APP currently.
For such Purchase Requisitions use the 'Assign and Process Purchase Requisition' APP instead to create the PO. 

Assign a fixed supplier to activate the 'Create Purchase Order' TAB and create a PO.  

APP Documentation 

INFNR, EMLIF, FLIEF, F1048A, Process Purchase Requisitions, Fixed Supplier, create purchase order , KBA , MM-FIO-PUR-REQ-SOC , Fiori UI for Sourcing Purchase Requisitions , Problem