Using a user event script, what is the best way to determine the record.Type of the "Created From" record on an item Fulfillment? I need the script to behave differently if the item fulfillment is created from a sales order or transfer order.

Maybe

var recordType = search.lookupFields({

type: search.Type.TRANSACTION,

id: internalid,

columns: 'type'

});

From the SO or TO you can load the record and then inspect the links sublist which has a field called type.

I prefer

lookupFields

for quick lookups,

record.load

is more intensive for a single column query

if you use "recordtype" instead of type in your lookup you can compare it using the record.Type. enum.