What is the difference between “Impact on the quantities in the inventory” and “No effect on inventory quantities”?

These two Settings are extremely important. With the help of these two Settings, the application is able to perform the correct validations and manage the products adequately, mainly from the Sales and Inventory module.

Inventory-relevant product categories are categories where their product must be in the inventory to be sold. These types of products can, among other things, be reserved, ordered, received, delivered, relocated, taken into inventory, etc.

While product categories having no impact on Inventory do not have to bypass all these inventory control steps. Rather, they are used to charge the customer for installation, extras, transport costs, or to apply a discount on Sales.