Unable to find a matching line for sublist apply with key: [doc error in uploading bill paymnet

AI generated answer (using internal Slack threads):

Based on the conversations, the error "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 incorrect line in a payment CSV file with multiple lines, the entire file will fail to upload. One suggestion to troubleshoot this issue is to run a saved search against the bills you are trying to import against, and expose the External ID for the lines. Ensure that these match your upload file of Bill Payments. If you are trying this process on lines you have never done it for previously, it’s possible they don’t have external IDs. In the case of creating a script that creates a customer payment for a bunch of invoices, the error message "You have attempted an invalid sublist or line item operation. You are either trying to access a field on a non-existent line or you are trying to add or remove lines from a static sublist" suggests that the code is trying to add new lines to a customer payment, which is not the correct operation. In the UI, you would edit an existing line, and the same should be done in the script. One alternative approach suggested is to use a CSV import for this operation, which can be utilized within a script. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******