The operational vault refers to the cash vault maintained by the grassroots branches of specialized banks and commercial banks that conduct external banking operations, for the purpose of handling daily cash receipts and payments. It holds the day-to-day working capital and constitutes a component of the money in circulation. [1] The cash held in operational vaults at all levels must be subject to a prescribed inventory limit. If the cash on hand in an operational vault falls short of this limit, the issuing vault shall, in accordance with the outbound instruction issued by the superior issuing vault, transfer the amount of issuance funds within the authorized outbound quota to the operational vault; this process is known as monetary injection. Conversely, when the cash held in an operational vault exceeds the authorized inventory limit, the excess must be immediately remitted back to the issuing vault; this process is referred to as monetary withdrawal.