2865932 - Error 'Material not fully maintained for this transaction/event' appears when viewing a Product in the App "Change Material " or "Create Material"

• Error 'Material not fully maintained for this transaction/event' M3308 appears when viewing a Product in the App "Change Material" or "Create Material" 
• A Product can be  viewed in the App Manage Product Master Data but not in the classical apps  "Change Material " or "Create Material" 
• Forecasting View  not created when using the app Manage Product Master Data to copy a Product

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

• Product / Master Data.
• SAP S/4HANA Cloud Public Edition All versions

SKU , "Stock Keeping Unit " , PSTAT , "Select views" , extend , "M3364"     "The material already exists and will be extended" , KBA , LO-MD-MM , Material Master , LO-MD-FIO-MM , Fiori UI for Product Master , Problem