It's hard because I don't fully understand how the item is set up and thus how to replicate this problem, I only know that it is a problem that I need to solve. But basically it seems to be a Kit item with 2 child items (this is not the only item with this problem, but it's one that I'm focusing on for now). The SO has all 3 line items (the top level and child items) but the generated PO only has the 2 child items. These two child items are what need to be on the IF as well. In the UI, when I click "Mark Shipped" on the PO, it works as expected and the two child lines from the PO are generated on a new IF. However in suitescript, when I transform the SO into an IF, only the top level item is on it

I did just see this in some documentation, not sure if it helps. "Initializing an item receipt from a dropship purchase order is not supported. The recommended workflow is to initialize an item fulfillment from the sales order that has the dropship item. The accounting impact will be the same and more desirable because inventory levels will not be affected."