I know that a sublist on a transaction has a unique line ID for each sublist line. Does anyone know how to access that in SuiteScript? This does not return anything var lineID = salesOrder.getSublistValue({ sublistId: 'item', fieldId: 'id', line: i });

Maybe try one of (take a look at the records browser! https://system.eu1.netsuite.com/help/helpcenter/en_US/srbrowser/Browser2021_2/script/record/salesorder.html):

Thanks!