For example, if there are 5 units available and the SafetyQuantity is 1, only 4 will be sent to Amazon. This can be set on a company level so that it defaults for all products, but it can still be overridden on a product level on AmazonProperties page.
Its important to realize that the safety quantity subtracts from the channels available quantity, so if there is an available quantity of 5 and you have a safety quantity of 5, a quantity of zero will be sent to the channel.
Each channel has a default company-level safety quantity and a product-level safety quantity. On the channel's Settings page, there are two safety quantity settings - one for regular products and one for replenishable products. Typically, Safety Quantity can be set to "0" for replenishable products, because there is no strict inventory for replenishable products.