Thanks to all for the kind help, problem sorted out, however the backfill is still a problem, it gets backfilled, but this data does not referesh, I have tried merge symbol, still does not refresh, if i delete the symbol with no backfill data, streaming from excell to ambibroker happens ithout a hitch. one more issue, in ambibroker i am getting symobol name as the date ( the firstcolumn in excell is being read as a symbol in addtion to the trading symbol)
1. Press f2 in any of the Ticker symbols in your NOW-Rt excel Sheet. The formula in cell will be seen. Take snapshot.
2. Open NSENOW2.format file in notepad and copy $FORMAT line or just the entire contents here.
3.Point out Symbol that is getting updated without hitch.
4.Point out Symbol that you are merging with it.