Hi Kurt!

Thank you for your question.

First, make sure to have a Delivery Order ready and validated, with a product that has an S/N and your Internal Reference.
Note the number of the WH/OUT. (In my example, it is WH/OUT/00316 . I also enabled the ​Display Lots & Serial Numbers on Delivery Slips in the settings)

Then, toggle the Studio mode, click on Reports, then Delivery Slip.

Here, the problem is that Sudio loads another WH/OUT than the one you were working on. This is an issue I'll report to our dev team. So, with the arrows at the top right of your screen, press one left, and you should be on the delivery order you readied with a S/N.

There, add a Table / Field Column field next to your S/N and select:
move_line (Product Moves (Stock Move Line)) > Lot/Serial Number > Internal Reference 

And that's it! :)​​
 

​​

Cheers,

Jonathan