2 or more contracts of the same counter can be settled using Net or Contra.
If you made a buy and sell trade of the same stock on the same day, you will only be required to settle the difference in amount of your outstanding trades.
e.g.
Outstanding buy contract value of AAPL: USD 500
Outstanding sell contract value of AAPL: USD 1000
Receive sales proceed of USD 500 credited into MCA on settlement dateIt depends. If on T+2 there are sufficient funds in your MCA to settle the buy 100 AAPL trade, your buy trade will be settled on T+2 and your sales proceeds for sell 100 AAPL will be credited on T+3.
However, if there are insufficient funds in your MCA to settle the buy trade on T+2, your buy and sell trade will be settled using the Net or Contra settlement process on T+3.