3420180 - Manage purchase contracts authorisation error with blank plant

A business user is assigned a business role that is restricted to a particular plant or plants.
When creating a Purchase Contract in the APP Manage Purchase Contracts, an authorization error is raised 
or the material description may be missing.  

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental." 

SAP S/4HANA Cloud Public Edition

• Create a business role based on the Purchaser template role SAP_BR_PURCHASER 
• Maintain a restriction in the role on plant 1010 
• Create a Purchase Contract in the APP 'Manage Purchase Contracts' 
• An authorization error is raised if the contract is created with no plant 

Missing configuration in the custom role 

Enter a blank entry for the plant along with the other restricted plants. 
App Maintain Business Roles > Maintain restriction as per the image below: 

werks, blank plant, Authorization error  , KBA , MM-FIO-PUR-SQ-CON , Fiori UI for Manage Purchase Contracts , Problem