Revenue Reversal Rules on Credit Memos
If you're crediting a transaction that uses invoicing and revenue scheduling rules, you must select a revenue reversal rule.
The revenue reversal rule determines how to manage the reversal of revenue that was recognized when the credited transaction was created.
There are three revenue reversal rules:
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            LIFO (Last In First Out): This rule reverses revenue starting with the most recent accounting period, and then reverses revenue in all prior periods until the credit memo is finished. 
- 
            Prorate: This rule reverses revenue by crediting an equal percentage to all account assignments for the transaction. 
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            Unit: This rule reverses revenue on the number of units that you specify on a transaction line. If you select Unit, you must enter a last period to credit, a quantity to credit, and an adjusted unit price on each applicable line. You can't enter a credit quantity that is greater than the quantity on the target transaction line.