To set the default information of inventory items,click the option “Maintain” and from drop down menu select the option of “Default information” and after that select the option of “Inventory iems” like below After clicking on inventory items, the following window will appear In this window you have five different tabs.. .General .General ledger accounts/costing .Taxes/shipping .Custom fields .Price levels In the general tab you have different options UPC/SKU Quantity available Sales invoice/Receipt out of stock warning message Sales order out of stock warning message You can choose the option behind the quantity available that you want to include purchase orders in quantity available or not..if you doted the option of include purchase order in quantity available then it will include the purchase orders otherwise not.. There are three options behind the sales invoice/receipt out of stock warning message .Dont warn me. .Warn if inventory item is out of stock based on quantity o...