Returns a numerical value, indicating the total number of entries for the specified position.
- PosBack - a numerical expression, specifying the position:
- 0 - open position;
- 1 - one position back (the last position closed);
- 2 - two positions back, etc.
If PosBack is not specified, a value for the open position will be returned.
- This function can only be used in signals.
Will return a value of 2 if there were two separate entries for the most recently closed position.