How do I link an existing invoice that was created from Quotes to an existing SO?

AI generated answer (using internal Slack threads):

In NetSuite, linking an existing invoice that was created from Quotes to an existing Sales Order (SO) is not directly possible through native functionality. The 'Created From' field on the invoice is not editable once the invoice is created. However, there are a couple of workarounds you could consider: 1. Custom Field: You can create a custom field on the Invoice record to store the internal ID of the related Sales Order. This would allow you to manually link the Invoice to the SO. However, this is a manual process and does not provide the same level of integration as the native 'Created From' link. 2. Delete and Recreate: If the Invoice has not been sent or paid, you could delete the existing Invoice and recreate it from the Sales Order. This would create a native link between the SO and the Invoice. However, this may not be feasible if the Invoice has already been sent or paid. 3. Workflow or SuiteScript: You could potentially use a workflow or SuiteScript to automate the process of creating the Invoice from the SO. This would involve creating a custom checkbox on the SO that, when checked, triggers a workflow or script to transform the SO into an Invoice. This would create a native link between the SO and the Invoice. However, this would require some development work and may not be feasible if you do not have access to a developer. Please note that these are workarounds and may not provide the same level of functionality as the native 'Created From' link. Always test any changes in a sandbox environment before deploying to production. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******