Because financial products such as stocks and futures were imported from abroad, and Hong Kong and Taiwan opened to the outside world earlier, there is also an "affidavit" in the actual futures operation. In futures trading, the relevant definition of "order interception" is as follows: before futures trading, futures traders require investors to agree to perform the contract. Usually refers to an agreement that futures brokers can write off when the customer's margin is insufficient.

As can be seen from the above definition, "declaration" is interpreted as "declaration and authorization document", which refers to the economic write-off of authorized futures when the customer's margin is insufficient.