No {{ ticker }} position open to flatten.
This message indicates that a position exists for the ticker, but the signal's flat sentiment does not qualify as an exit for that position's side. For example, sending sentiment=flat with action=buy when you hold a long position will not flatten it — a sell-side exit is required instead. When no position is open, TradersPost returns no-open-position (or no-open-position-reverse for reverse) instead of this message.
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