R 12.1.3 - Is there a way to modify the order of fields or remove some in a Delivery sub-form (RCVTX

I have created a lot number flexfield where receivers can indicate additional information on a newly-genetrated lot number (eg certificate type, time used if a serviceable item, etc). In most cases it's a Yes/No value set because there is logic built in other apps (non-Oracle) that restricts item issuance based on the type of certificate associated with the lot number.

Life was good in 11.5.10 because it was an easy proposition. Tab once to get a lot number assigned, tab again to indicate quantity, tab one more time to evoke the flexfield. (if the item is under shelf life control, there's one more tab action to the field where expiry date is entered)