Single warehouse: why is "transfer to manufacture" still required?


I used to have 3 warehouses:

  • Raw material
  • In progress
  • Finished goods

But I understood that I can simplify since I work in a simple small studio and in reality there is really only one warehouse: our studio. So now I customised ERPNext to have just one warehouse. And all seems to work. But I’m intrigued by one thing:

It still forces me to “transfer material to manufacture”

This doesn’t seem to make any sense or serve any purpose.
How can I make ERPNext (cloud version) skip this step?