Thank you i960.That's a STOP PRT order not a stop. IB has access to it if you change the order type.
I cannot see STP PRT under any of the "Attached Stop Order > Order Type" settings - looking in Presets, Hotkeys and Buttons. It is listed under the "Primary Order > Order Type" drop down list, but it is greyed out and not available for selection. Is there some way for me to enable it for selection as a Stop Order?