Hi there,    

I have a problem with POS in Odoo Community 13.0.

In the POS interface, whenever I try to click on the "price" button in the lower left corner of the screen I get a red error box that pops up which reads:

"MODULE ERROR Adjusting the price is not allowed".

A previous answer to a similar question didn't make any sense to me as I can't see any option to 

 "Restrict price modification to managers" - under "Price Control"   - where can I find such a button or menu option?

Many thanks in advance!

Brendan