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Using SuiteScript to Detect Change of "Shipping Via" Field

edited Jun 2, 2025 2:45PM in Ask A Guru 3 comments

We are trying to have some client-side SuiteScript trigger whenever the Shipping Via field changes on an Item Fulfillment record. (This is the native, built-in Shipping Via field and not a custom one.)

So when this field changes, we want to trigger some script that automatically fills in a custom Third Party Account # field:


However, whenever that Shipping Via (Method) selection changes, we get an error in the script, like below:


Does anyone know what that package_machine is not defined error signifies? And how to overcome it? Or what's causing it?

We have tried both the fieldChanged and postSourcing

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