If the input ticket is issued late or the invoice is in doubt, the following methods can be considered to eliminate the doubt: 1. If the input ticket is opened late, you can ask the supplier the reason and ask for a new input ticket as soon as possible. 2. If there is any doubt about the invoice, you can ask the supplier to provide relevant supporting documents to prove the authenticity of the invoice. For example, if the goods or services on the invoice are not actually provided, the supplier may be required to provide proof of delivery or other supporting documents. If the supplier can't provide supporting documents, you can report the matter to the tax authorities and ask for verification of the invoice. If the information on the invoice is found to be incorrect, you can ask the supplier to correct the invoice information. In a word, you can take many measures to dispel doubts, but the most important thing is to keep in touch and deal with problems in time.