The current output positive invoice amount is less than the negative invoice amount. According to the announcement of the tax bureau, when there are positive and negative numbers in the bonded materials account, most of the positive invoice amount of the current output is less than the negative invoice amount, so it is negative when reporting. If it is negative, the system comparison will fail. You should bring the application materials, official seal and ID card of the agent to the tax hall to fill in the form and declare. Where goods imported from abroad are re-processed and exported in order to avoid going through the formalities of export tax refund in the future, they will not be recorded at the time of import and will be exempted from customs duties first, which is called bonded.