function 'addtxn' in blotter package can't add intraday trade into account?

hi,guys,I'm learning blotter package,and have coded several trade strategies
in R.
all are good when the strategis run on daily data,but when I run on intraday
data, function 'addtxn' runs incorrectly.

the strategy stores trade signals of each bar,when close price cross over
sma,signal = 1,close price cross under sma, signal = -1,otherwise, signal =
0

and the bar-by-bar treatment are:

#Bar-by-bar treatment
for( i in 17:nrow(if2) )
{
  currentDate <- time(if2)[i]

  equity<-getEndEq(b.strategy, currentDate)
  Posn <- getPosQty(b.strategy, Symbol='if2', Date=currentDate)
  #cat(as.character(i),"position on current bar is ",Posn, append = FALSE)

  if(!is.na(MA[i-2]))
  {
    if( Posn == 0 ) { #no marketposition
      if( signal[i] == 1 ) {
        #long entry
        #openprice <- as.double((Op(if2[i])))  #the result is the same as
the following line
        openprice <- as.double((Op(if2[currentDate])))
        unitsize <- abs(as.numeric(trunc(equity/(openprice*300*0.15))))
        addTxn(b.strategy, Symbol='if2', TxnDate=currentDate,
               TxnPrice=openprice, TxnQty = unitsize ,
TxnFees=-openprice*300*0.00005*unitsize, verbose = F)
      }
    }
    else {
      if( signal[i] == -1 ) {
        #exit position
        openprice <- as.double((Op(if2[currentDate])))
        unitsize  <- abs(getPosQty(b.strategy, Symbol='if2',
Date=currentDate))
        addTxn(b.strategy, Symbol='if2', TxnDate=currentDate,
               TxnPrice=openprice, TxnQty = -unitsize ,
TxnFees=-openprice*300*0.00005*unitsize, verbose = F)
      }
    }
  }

  updatePortf(b.strategy, Dates = currentDate)
  updateAcct(b.strategy, Dates = currentDate)
  updateEndEq(b.strategy, Dates = currentDate)
}

these are signal's table

relating trades info when getting by function 'getTxns':

                    Txn.Qty Txn.Price Txn.Fees Txn.Value Txn.Avg.Cost
Net.Txn.Realized.PL
2012-01-18 00:00:00       0       0.0        0         0            0
0
2012-01-18 09:35:00       0    2580.0        0         0          NaN
NaN
2012-01-18 09:54:00       0    2580.8        0         0          NaN
NaN
2012-01-18 09:58:00       0    2581.8        0         0          NaN
NaN
2012-01-18 10:33:00       0    2552.6        0         0          NaN
NaN
2012-01-18 10:40:00       0    2552.6        0         0          NaN
NaN
2012-01-18 10:57:00       0    2555.4        0         0          NaN
NaN
2012-01-18 11:00:00       0    2559.6        0         0          NaN
NaN
2012-01-18 11:14:00       0    2562.8        0         0          NaN
NaN
2012-01-18 11:26:00       0    2555.8        0         0          NaN
NaN
2012-01-18 11:29:00       0    2553.4        0         0          NaN
NaN
2012-01-18 13:01:00       0    2556.0        0         0          NaN
NaN
2012-01-18 13:26:00       0    2549.2        0         0          NaN
NaN
2012-01-18 13:44:00       0    2553.8        0         0          NaN
NaN

from the table, only time and trade price are added, TxnQty, TxnFees, and
other info are ignored.

why it happen,do I miss something?

regards.