if there are multiple item fulfillments against a given transfer order, in a script to receive the transfer order how do I specify which specific item fulfillment I want to receive against? You can only do a record.transform() from transferorder to itemreceipt. There is no supported transformation from itemfulfillment to itemreceipt, and the item(s) have to be fulfilled first in order to receive

I had a similar issue with Item Fulfillments when invoicing a sales order. Hopefully your fate is not the same as mine, because I eventually hit a dead end - there is no direct link between an invoice and the item fulfillment(s) it was created from.