Generally, there are two reasons: 1, the invoices issued by suppliers are not copied for tax returns, and the tax authorities do not have the relevant data of invoices.

2. After the invoice authentication, the authentication data has not been transmitted to the export tax refund system, and the electronic information lags behind.

Generally, this happens when new enterprises just start to apply for tax refund. Normal declaration is ok, and it does not affect the tax refund declaration.