The reason for the discrepancy between the social credit code and the document number on the small restaurant cancellation application form is that small restaurant businesses use different types of documents when registering with different registrars or government departments. Some of them use business license number and some of them use ID card number. The social credit code is a standard unified credit code that is unique to all businesses. Therefore, when applying for deregistration, different document types will result in inconsistencies between the social credit code and the document number.