Do External IDs have to be unique across all records, or just unique per record type?

AI generated answer (using internal Slack threads):

External IDs in NetSuite do not have to be unique across all records. They only need to be unique per record type. This means that you can have the same external ID on different types of records, such as a transaction and an item. However, it's important to note that this behavior was changed a few years ago, so older accounts may have duplicate external IDs. When it comes to setting values for list/records or loading a record, you can only do this using the Internal ID. If you have the External ID from another system and need to pass a large number of records, you may need to create a complex filter using 'OR'. For items, there is an External ID field. However, by default, you cannot access it from the UI. You can set the external ID (which should be unique for the record type) for the records via CSV. If you want to display it in the UI, you can use a custom field and source the "external id" value from the native field. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******