Cancellation of Back Order is the process of canceling an order for a product that has been previously placed but cannot be fulfilled due to stock availability or any other reason. This is typically done after a customer has placed an order, but before it is shipped. The types of Cancellation of Back Order are: 1. Partial Cancellation: This occurs when only part of the order is cancelled, leaving the remainder of the order to be shipped. 2. Full Cancellation: This occurs when the entire order is cancelled. 3. Cancellation due to Stock Availability: This occurs when the product is out of stock and cannot be fulfilled. 4. Cancellation due to Payment Issues: This occurs when the customer is unable to pay for the order, and it cannot be fulfilled. 5. Cancellation due to Other Reasons: This occurs when an order cannot be fulfilled due to other reasons, such as incorrect information or shipping issues.