TradeStation Help
At some point, you may want to reset your Position Graphs if TradeStation has not been restarted for several days or if a bad tick causes erroneous values. You can reset the minimum profit/loss and maximum profit/loss figures shown on the Position Graphs for a single symbol, or for all symbols.
In the case of a winning position, the minimum profit/loss value will be reset to zero and the maximum profit/loss value will be reset to the opening profit/loss value. In the case of a losing position, the minimum profit/loss value will be reset to the opening profit/loss value, and the maximum profit/loss value will be reset to zero.