Write-off is a means for the state to support and control foreign exchange. Through verification, the state can control the receipt and payment of goods exported by enterprises, and the foreign exchange countries needed for imported goods should also be counted. In order to support the country's foreign exchange reserves.

Write-off is a process in which the value of goods declared for import and export is consistent with the payment and receipt of foreign exchange by banks. This process is managed and supervised by the State Administration of Foreign Exchange.