Order are rejected when not fulfilling certain criterion. This is what NSE says on order types.
DAY - A Day order, as the name suggests, is an order which is valid for the day on which it is entered. If the order is not matched during the day, the order gets cancelled automatically at the end of the trading day.
IOC - An Immediate or Cancel (IOC) order allows a Trading Member to buy or sell a security as soon as the order is released into the market, failing which the order will be removed from the market. Partial match is possible for the order, and the unmatched portion of the order is cancelled immediately.
http://www.nseindia.com/content/fo/fo_ordercond.htm
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Ashok, could you be more elaborate on your question please?
Orders could be rejected, but there is no such a thing called rejection orders!