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AI generated answer (using internal Slack threads):

The error message "Unable to find a matching line for sublist apply with key: [doc,line]" typically occurs when NetSuite is unable to find a bill to pay in the exact amount of the payment you are uploading. If there is even one line that is incorrect in your CSV file, the entire upload will fail. This error can also occur when you are trying to apply a payment to a bill that does not have a matching external ID. To troubleshoot this, you can run a saved search against the bills you are trying to import against, and expose the External ID for the lines, and ensure that matches your upload file of Bill Payments. In the context of scripting, this error can occur when you are trying to add new lines to a customer payment, which is not allowed. In the UI, you would edit an existing line, and the same applies to scripting. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******