In the event an item is not available for sale this feature lets the user set up alternate or substitute items that can be sold in its place.
 

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In sales order entry after the item and quantity are entered and the item is not available this back-order screen displays.
 

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To view the alternate or substitute items that can be sold in its place click on the Alternate Items button.
 

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Check the Include box for the item you want to substitute and the original item on the sales order will be replaced with this alternate item.