When I choose a product and a supplier, the price is automatically retrieved. I enter a quantity and the total cost calculation is carried out.

Once I click save, the price of the item is not saved and is zeroed out. The price field is not read only (even though I want it to be uneditable by the user) and I have used store=True and the values are not saved. It is not even saved into the database table. Why does this happen?