I configured a store with multiple websites on Magento 2. Each website is a different country or region and each website must manage it's own product quantity
I set quantity_and_stock_status attribute scope to website in Stores/Attributes/Product, but when I edit quantity in product detail under specific store view the value is saved for all views.
An example Two website: Italy and UK, Two stores: Milan under Italy with Milan StoreView, Manchester under UK with Manchester StoreView.
I select a product and select Manchester StoreView, edit quantity to a value (i.e 10) and save, the same quantity is reported in Milan StoreView. Near Quantity and Stock value is reported [STORE VIEW] scope and Use Default Value is unchecked.