When setting up eBay as a sales channel in Skubana, the eBay Out of Stock option is turned on by default. This enables the out-of-stock option, normally available from My eBay>Site Preferences, on your eBay account.
When you run out of inventory, this option removes your listings from search results. When you add more inventory to the listing, it again appears in searches. Thus, your customers will not be able to order listings for which you do not have any stock, preventing you from overselling, a factor that could adversely affect your seller performance on eBay.