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I cannot seem to set an items externalid via suitescript (beforeSubmit UserEvent). However... I can set it via a browser console.
Anyone ever experienced this?
```context.newRecord.setValue({ fieldId: 'externalid', value: id });```

SuiteAnswers: The *External ID* of an item record is a standard field that cannot be modified through *User Interface*. Modification can only be accomplished through *CSV Import*.

Not exactly true because I can set it in the browser console.

but you can any other time you actually save the record

```require(['N/record'], function (record) {
  const instance = record.load({ type: 'assemblyitem', id: 201369 })
  instance.setValue({ fieldId: 'externalid', value: 'works' });
  instance.save()
})```

probably why that worked in the browser console...

You can set it in a UE. I have a script that does this that we use all the time. You have to load/save, you cannot use newRecord or submitFields. You also cannot set it to empty/null after it's been set.