Use this window to view existing Invoice Preview information or to modify existing invoice preview lines. For an example, the existing Invoice Previews are the ones which are created for the services done through work orders or work tasks.
This window can also be used to make price alterations (e.g., Sales price) of an invoice. To do this, the invoice should not have been approved.
In addition, you can use this window to create a credit invoice.
Approve Invoice Preview
Revoke Approval of Invoice Preview
Modify Invoice Preview Lines
Create Credit Invoice