Such failure is due to the non-standard completion of the customs-supervised certificate. The system cannot find the information if the relevant information of the certificate is filled in other places or in a wrong manner when the system logically judges whether the name and number of the certificate are filled out in the column of "accompanying documents".
General Administration of Customs of the People's Republic of China
Address: No.6. Jianguomennei Avenue, Dongcheng District, Beijing, China Postcode: 100730