How does the Product Stock Update workflow affect the product stock?

Here are the scenarios under which Invoices impact Quantity in Stock: 

• When an invoice is created, the quantity in stock will decrease.
• When an invoice is canceled or deleted, the quantity in stock will increase.

Here are the scenarios under which Purchase Orders impact Quantity in Stock: 

• When the purchase order status is changed to ‘received shipment’, the quantity in stock will increase.
• When the purchase order is canceled, the quantity in stock will decrease.