SL order - error

eine91

I had placed below SL order:

'tradingsymbol' => 'XXX',

'exchange' => 'NSE',

'product' => 'MIS',

'validity' => 'DAY',

'transaction_type' => 'BUY',

'order_type' => 'SL',

'trigger_price' => '100',

'price' => 100,

'quantity' => Y,

When price moved up of Rs.100, order status changed to OPEN, but does not executed though my 'price' was also Rs.100.

Whats went wrong?