Issue a Credit Memo Without Impact on Inventory
1. Use a zero quantity on the transaction.

1. When creating the credit memo/refund, change the item’s quantity to zero and retain the amount.
   If a popup says The total line amount is not equal to the item price times the quantity. Is this correct? displays, click OK.
2. Click Save.

OR

2. Create a journal entry, using the GL account or related Gl account shown below. 

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Once you opt to select either 1 or 2, you will then apply this to an open invoice of the customer:

1. Go to the open invoice 
2. Click Accept Payment button 
3. Apply for tab>Credits
4. Select from the list the journal/credit memo you have created. 

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Check the credit to apply and place the amount on the credit column.
Then save. 

Note: The ability to create a credit memo and associate it with an amount instead of an item is currently being tracked by Enhancement 81003.