3065647 - Error "Active document has been changed concurrently" when accessing a planning object on the Manage Product Allocation Planning Data App

When you open a planning object on Manage Product Allocation Planning Data APP on the Fiori, you see error message
"Active document has been changed concurrently".

Product Allocation, Error, Planning Object, Unable to load data, time out, timeout , KBA , CA-ATP-PAL , ATP: Product Allocation , Known Error