When you see the message "RejectIfOpening" it means an opening order for that contract is not allowed for your account. This rejection typically occurs when the account has a "Pending Task" that still has to be completed. Look in Pending Items at the top of the Client Portal, click on the Bell icon in the upper right corner as per our Users' Guide.
The rejection message also applies to IRA accounts that submit an order for a symbol that is organized as a partnership with unrelated business taxable income (UBTI), such as a Master Limited Partnership (MLP) or a Publicly Traded Partnership (PTP). Due to IRS reporting requirements IBKR does not allow IRA accounts to hold any MLP or PTP with UBTI products.
Non-US accounts may also see this rejection for an equity derivative that is potentially subject to withholding tax under US Internal Revenue Code section 871(m). In addition, the message can be used if IBKR has placed a restriction on that symbol.
For additional information regarding a specific order rejection, please contact IBKR Client Services and select "Trade Issues".