Order err

I tried to modify a partfilled order (1 out of 50) got filled). However the same was not modified. Can you please tell what went wrong.

in the modification request the field 'pending_quantity' is showing as 50 (since its partfilled should'nt it be 49?).

the put request we send do not have that field.

our put payload looks like this:

string.Concat("api_key=", apiKey,
                    "&access_token=", accessToken,
                    "&tradingsymbol=", kInstrument.tradingsymbol,
                    "&exchange=", kInstrument.exchange,
                    "&transaction_type=", orderAction,
                    "&order_type=", orderType,
                    "&product=", product,
                    "&quantity=", Math.Max(1, order.Quantity * kInstrument.lot_size),
                    "&price=", order.LimitPrice,
                    "&trigger_price=", order.StopPrice,
                    "&validity=", timeInForce);

heres the complete order logs

{"status": "success", "data": [{"status": "CANCELLED", "product": "CNC", "pending_quantity": 0, "order_type": "LIMIT", "exchange": "NSE", "order_id": "170405000616033", "price": 1094.02, "exchange_order_id": "1100000004464082", "order_timestamp": "2017-04-05 16:09:08", "transaction_type": "BUY", "trigger_price": 0.0, "validity": "DAY", "disclosed_quantity": 0, "status_message": null, "average_price": 1094.02, "quantity": 50}, {"status": "OPEN", "product": "CNC", "pending_quantity": 49, "order_type": "LIMIT", "exchange": "NSE", "order_id": "170405000616033", "price": 1094.02, "exchange_order_id": "1100000004464082", "order_timestamp": "2017-04-05 15:22:57", "transaction_type": "BUY", "trigger_price": 0.0, "validity": "DAY", "disclosed_quantity": 0, "status_message": "16346 : Order cannot be modified", "average_price": 1094.02, "quantity": 50}, {"status": "NOT MODIFIED", "product": "CNC", "pending_quantity": 50, "order_type": "LIMIT", "exchange": "NSE", "order_id": "170405000616033", "price": 1094.2, "exchange_order_id": "1100000004464082", "order_timestamp": "2017-04-05 15:22:57", "transaction_type": "BUY", "trigger_price": 0.0, "validity": "DAY", "disclosed_quantity": 0, "status_message": "16346 : Order cannot be modified", "average_price": 1094.02, "quantity": 50}, {"status": "OPEN", "product": "CNC", "pending_quantity": 49, "order_type": "LIMIT", "exchange": "NSE", "order_id": "170405000616033", "price": 1094.02, "exchange_order_id": "1100000004464082", "order_timestamp": "2017-04-05 15:21:36", "transaction_type": "BUY", "trigger_price": 0.0, "validity": "DAY", "disclosed_quantity": 0, "status_message": null, "average_price": 1094.02, "quantity": 50}, {"status": "MODIFY PENDING", "product": "CNC", "pending_quantity": 50, "order_type": "LIMIT", "exchange": "NSE", "order_id": "170405000616033", "price": 1094.02, "exchange_order_id": "1100000004464082", "order_timestamp": "2017-04-05 15:21:13", "transaction_type": "BUY", "trigger_price": 0.0, "validity": "DAY", "disclosed_quantity": 0, "status_message": null, "average_price": 0.0, "quantity": 50}, {"status": "MODIFY VALIDATION PENDING", "product": "CNC", "pending_quantity": 50, "order_type": "LIMIT", "exchange": "NSE", "order_id": "170405000616033", "price": 1094.02, "exchange_order_id": "1100000004464082", "order_timestamp": "2017-04-05 15:21:13", "transaction_type": "BUY", "trigger_price": 0.0, "validity": "DAY", "disclosed_quantity": 0, "status_message": null, "average_price": 0.0, "quantity": 50}, {"status": "OPEN", "product": "CNC", "pending_quantity": 50, "order_type": "LIMIT", "exchange": "NSE", "order_id": "170405000616033", "price": 1094.02, "exchange_order_id": "1100000004464082", "order_timestamp": "2017-04-05 15:04:56", "transaction_type": "BUY", "trigger_price": 0.0, "validity": "DAY", "disclosed_quantity": 0, "status_message": null, "average_price": 0.0, "quantity": 50}, {"status": "OPEN PENDING", "product": "CNC", "pending_quantity": 50, "order_type": "LIMIT", "exchange": "NSE", "order_id": "170405000616033", "price": 1094.02, "exchange_order_id": null, "order_timestamp": "2017-04-05 15:04:56", "transaction_type": "BUY", "trigger_price": 0.0, "validity": "DAY", "disclosed_quantity": 0, "status_message": null, "average_price": 0.0, "quantity": 50}, {"status": "VALIDATION PENDING", "product": "CNC", "pending_quantity": 50, "order_type": "LIMIT", "exchange": "NSE", "order_id": "170405000616033", "price": 1094.02, "exchange_order_id": null, "order_timestamp": "2017-04-05 15:04:56", "transaction_type": "BUY", "trigger_price": 0.0, "validity": "DAY", "disclosed_quantity": 0, "status_message": null, "average_price": 0.0, "quantity": 50}, {"status": "PUT ORDER REQ RECEIVED", "product": "CNC", "pending_quantity": 0, "order_type": "LIMIT", "exchange": "NSE", "order_id": "170405000616033", "price": 1094.02, "exchange_order_id": null, "order_timestamp": "2017-04-05 15:04:56", "transaction_type": "BUY", "trigger_price": 0.0, "validity": "DAY", "disclosed_quantity": 0, "status_message": null, "average_price": 0.0, "quantity": 50}]}