Day Orders Will Be Accepted After Cash Settled Session Ends Error

Are you trying to route a day order for the next day right after the closing bell, but received the following error message, "Day orders will be accepted after Cash Settled Session ends." It's not a bug, but there by design. There are actually a handful of underlyings whose options trade 15-minutes after the close. Once that session ends, or after 3:15 pm (Central), you'll be able to enter your trade.