In Rest API, why am I getting Error while accessing a resource. You must have at least one valid line item for this transaction, while the same action works in the ui and I verified that orderLines are correct

AI generated answer (using internal Slack threads):

Based on the conversations, the error "You must have at least one valid line item for this transaction" in Rest API can occur due to several reasons: 1. Incorrect Endpoint: Make sure you are hitting the correct endpoint. In one of the threads, the user was trying to send subscription data but hitting the invoice endpoint. This led to the error. Always double-check the endpoint you are using. 2. Order Line Index: Ensure that the order line index starts from the correct number. In some cases, the order line index starts from 0, not 1. 3. Line Level Inventory Location: If you have line level inventory location, you need to ensure that the inventory location is correctly specified in your request. 4. Valid Line Items: Ensure that the line items you are trying to process are valid. They should exist in the sales order and should have available quantity. 5. Correct JSON Structure: Make sure that the JSON structure you are using in your request is correct. Any missing or incorrect fields can lead to this error. Remember to always verify your request against the UI to ensure that the action you are trying to perform via the API is possible in the UI. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******

How can I override it to work even if no available quantity?