Let's say you have a Closed Sales Order that you want to revert to Invoiced.
In order to be able to reopen closed documents, you should have , firstly , enabled the corresponding permissions. Navigate to your account's permissions, select
Documents ( Sales Quotes and Orders ):
After that, tick the option on the top of the page so that your user can re-open closed documents.
Now, navigate to the Sales Order you want to re-open.
Click More and see the following menu:
Re-Open Document option reverts your Sales Order from Closed to Invoiced.
If you want to revert the Sales Order from Invoiced to Verified and re-edit the quantities and the prices of a product , check this article .