# Sale Amendment Module

The sale amendment module allows you to change sales that are being processed and keep track of the changes. An amendment is composed of action lines which can:

- Recompute taxes (if the customer tax rules or product taxes have changed).

- Change the payment term

- Change parties and addresses

- Change the warehouse

- Change a sale line:

  > - the product (for one with the same UoM category)

  > - the quantity and unit of measure

  > - the unit price

  > - the description

When the amendment is validated the sale is updated and given a new revision. Generated documents (like shipments and invoices) that are still in a draft state are replaced with new ones based on the new values.