what does this error mean when i attempt to import a vendor payment Unable to find a matching line for sublist apply with key: [doc,line].

AI generated answer (using internal Slack threads):

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. This can happen when you are trying to import a payment CSV file with multiple lines and even if one line is incorrect, the entire file will fail to upload. The 'line' is not a reliable key to use when trying to match the payment with the bill. The 'doc' acts as the key in customer payments, which is a similar record to vendor payments. However, even if you assign an external id to the created vendor bill, you might still encounter the same error. This suggests that the API might not be working properly for vendor payments. To troubleshoot this issue, 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. If you are trying this process on lines you have never done it for previously, it’s possible they don’t have external IDs. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******