# Purchase Amendment Module

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

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

- Change the payment term

- Change the party and the address

- Change the warehouse

- Change a purchase 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 purchase is updated and given a new revision. Generated documents (like moves and invoices) that are still in a draft state are replaced with new ones based on the new values.