how to lock some fields after save record by using only workflow

AI generated answer (using internal Slack threads):

****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ****** To lock some fields after saving a record using only a workflow in NetSuite, you can use the 'Set Field Display Type' action in your workflow. This action allows you to change the display type of a field to 'Inline' or 'Disabled', effectively 'locking' the field from further edits. Here are the steps to do this: 1. Create a new workflow or edit an existing one. 2. Add a new action to the workflow. Choose 'Set Field Display Type' as the action type. 3. In the action settings, select the field you want to lock in the 'Field' dropdown. 4. Set the 'Display Type' to 'Inline' or 'Disabled'. 'Inline' will allow the field to be displayed but not edited, while 'Disabled' will gray out the field and prevent it from being edited. 5. Save the action and the workflow. This workflow will then 'lock' the specified field after the record is saved. Note that this will only affect the display of the field on the form, and will not prevent changes to the field through scripts or other means. In addition, you can use the 'Return User Error' action on the 'Before User Submit' trigger to prevent the record from being saved if a certain condition is not met. This can be useful if you want to ensure that certain fields have the correct values before the record is saved. Please note that the effectiveness of this method may depend on the specific requirements of your use case, such as the number of fields you want to lock, the type of fields, and whether the periods are closed.