Anyone know why the native field Shipping Carrier (ID=shipcarrier) doesn't trigger any updates? For example if you change the value, there's no history of that change in System Notes and if you look at the new record vs old record, the new record has a value (which is actually TEXT and not a numeric ID) and the old record is always undefined.

its a weird field that is basically used to limit the select options of the shipping method field

Yeah that makes total sense now. Thanks. I'll go that direction. I was wondering why it was never picking it up. Ive never seen that in the 7 years ive been doin this