Regulations Governing Foreign Exchange Business of Securities Enterprises Article 51

A DSF shall draw up its position limits such as "transaction positions for individual currencies" and an "overnight position for each trader". All its units shall abide by these limits, and carry out audits regularly.
中文原文 證券業辦理外匯業務管理辦法第51條
外匯證券商應自行訂定「各幣別交易部位」及「交易員隔夜部位」等各項部位限額,責成各單位確實遵行,並定期辦理稽核。

English translation for reference only; the Chinese text prevails. Not legal advice.