Is there a way to modify/add a discount to an invoice after it has been posted but is still open?

Is there a way to modify/add a discount to an invoice after it has been posted but is still open?
Hello Marthas,
There is no option that will allow you to add a Discount to an Invoice once it has been posted. You will need to void the Invoice and recreate it with the Discount if you would like the Discount on the Invoice.
One option that might work for you is add a Discount during the Apply Process. You can test the steps below and determine if it provides the end results.
I recommend testing in a test company with a copy of live.
KB 871973 How to set up a test company that has a copy of live company data by using SQL Server 7.0, SQL Server 2000, or SQL Server 2005
NOTE: Please make sure that you have a restorable backup prior to performing any troubleshooting steps.
If that does not give the correct results, you will need to void and recreate the Invocie.
I hope this helps!
Thank you!
Microsoft Support Engineer | Brandon Jarrett