Per <https://system.netsuite.com/app/help/helpcent...
# suitescripte
erictgrubaugh
12/17/2020, 7:14 PMPer https://system.netsuite.com/app/help/helpcenter.nl?fid=section_1502309188.html (standard NS documentation caveats apply):
Fields set to Show in List on the [child] record type appear in the sublist. However, you can update any [child] field via scripting.