Hi Miguel,

Yes, if you create back-order in each step the issue will be resolved. In essence it is reflecting the users actions at each step. For eg. an SO having 5 qty, will create a 'delivery order' for 5qty and 'Pick' for 5 qty.

"Pick" has 5 qty, but only 3 in stock and picked. The user validates 3qty and creates a back-order for remaining 2 qty. The shipping team also validate only 3qty (as that is what is actually shipped) and create a backorder which creates a 'delivery order' for remaining 2 qty.

By not creating a back order, Odoo will cancel that step. In this case, it is like the customer doesn't want or your don't plan to ship the remaining 2 qty

For the sales orders where the backorders haven't been created: 

Would you know how many such orders are on your system?

A couple suggestions : (You might have to test these before executing as I haven't done so)

1. Duplicate the 'done' delivery order and then manually modify the product & qty which are yet to be shipped

2. From each sale order, click the truck icon, this would bring up a screen with all the linked transfers. Create a new delivery order with the product and qty

2. Add a dummy product in each Sales order, this would create another delivery order which would hopefully have the dummy product + the undelivered products.

Hope this helps!

Best regards