Vietnam form e does not check the third-party invoice, and t

Hello, we need to apply for the form e certificate of origin for exporting Ho Chi Minh, Vietnam. We have the right to import and export, and we can do it ourselves, but I can't do it. We issued the certificate twice before, and the customer can't use it. The first time we asked someone to handle it, we didn't check the third-party invoice, and the second time we filled in the wrong weight. I don't know what other pits are there. I can't be wrong this time, Because I have seen your website before, many of your answers are very professional, so I want to find you.