A shipment can process under a previous order's number and details if you load one order through your integration and then load a different order without clicking Reset first.

Cause

Loading a new order number does not fully clear the shipping screen on its own. If you load one order and then load a different order without clicking Reset, the previous order's number and data can stay on the screen, so the shipment processes under the wrong order. A full clear needs the Reset action.

Fix

  1. After you load an order, if you need to back out or you hit an error, click Reset before you load a different order.
  2. Load the new order number.
  3. Check that the order details on screen match the order you mean to ship.
  4. Process the shipment.

What you should see

The processed shipment shows the correct order number, and loading a different order after Reset does not carry over the last order's data.