can not override Advanced Numbering

AI generated answer (using internal Slack threads):

Based on the conversations, it appears that the 'Allow Override' option under

Setup > Company > Setup Tasks > Auto-Generated Numbers

in NetSuite allows you to override the auto-generated numbers. However, once a number has been used, it cannot be changed in edit mode. If you need to use legacy document numbers for migrating transactions such as invoices, you can temporarily turn on the 'Allow Override' option. This will allow you to use the legacy document numbers in the Invoice No. field. However, be aware that this could lead to inconsistencies if the numbering scheme of the legacy system is different from yours. Alternatively, you could store the legacy numbers in a custom field. However, these numbers will not show up by default in customer statements unless it's a custom field. If the legacy numbering scheme would cause duplicates, you could add a dash abbreviation to the end of the numbers. This is usually understandable to most companies. Another suggestion is to set the numbering to behave on a per subsidiary basis, define the "start" number, do the import, and then turn on the 'Allow Override' option after you're done. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******