Working with Large Objects does not work with a generated RAP business object

Since I ran into this problem today and since it took me some time to find the root cause I thought I will post it as a question and answer the same myself. I was preparing a demo where I want to show the upload of a receipt in a UI service based on a RAP business object. For this I used the “OData UI Service from scratch” generator and later on the “OData UI Service” Generator that starts from a table.