The trading system will carry slightly lower margin as against what's seen in the MTF statement. This is because, in the MTF statement, the minimum margin required will be 45% while it is 50% in the trading terminal. 

Let's understand with an example. Navigate to Funds and view the detailed menu under ALL|ALL|MTF. The web page view will be as below

To view this in the Exe, select RMS - View Limits

Here the Cash Margin available is = Cash Collateral + Stock Collateral (After haircut) - Other Loss.

It is basically the total margin that you have deposited after adjusting for the loss booked and the charges which is nothing but the Other Loss

Use Margin = Margin required on the funded stocks + M to M loss.

The difference is the net margin that is available or the shortage.