Valid for the current day (D) - an order marked D is valid no longer than until the end of the trading session on the day it was submitted to the exchange. Valid until a specified date (WDD) - an order marked WDD is valid no longer than until the end of the day designated as the order validity date, but no longer than 365 days from the date it was submitted to the exchange.
Valid for an indefinite period (WDA) - an order marked WDA is valid for no longer than 365 days from the date of submission to the exchange (in practice, until the end of the calendar year).
Valid until a specified time (WDC) - an order marked WDC is valid no longer than the time specified in the order on the day it is submitted to the exchange, but no longer than the end of the trading session on the day it is submitted to the exchange. The validity time of the order shall be stated to the nearest second.
Valid for fixing (WNF) - an order with the WNF designation shall be valid until the end of the nearest opening phase, closing phase or balancing period, respectively, on the day the order is submitted to the exchange. An order with this designation may be submitted to the exchange in any phase of the session in which orders of a given type may be submitted, but it is added to the order book at the start of the nearest pre-opening phase, pre-closing phase or balancing period, respectively.
Valid to close (WNZ) - an order with the WNZ designation is valid until the end of the closing phase on the day it is submitted to the exchange. An order with this designation may be submitted to the exchange during any phase of the session in which orders of a particular type may be submitted, but is added to the order book at the start of the nearest pre-closing phase.
Execute and Cancel (WIA) - (order valid until first execution). The order is valid until the first trade (or first trades if the order is executed simultaneously in several trades). The order is executed immediately upon entry and may be partially executed. If it is partially executed, the unexecuted part is no longer valid. A WIA-marked order may only be submitted to the exchange in the continuous trading phase and in the catch-up phase.
Execute or Cancel (WLA) - the order is valid until the first transaction (or first transactions if the order is executed simultaneously in several transactions) is concluded. The order is executed immediately after entry, but only in its entirety - it cannot be partially executed. If the order layout in the sheet on the opposite side does not allow execution in full, it is no longer valid. An order marked WLA may be submitted to the exchange only in the continuous trading phase and in the post-auction trading phase.