Nope. Margin shortfall and debit balance are not the same.
Margin shortfall is when you don’t have enough margin in your trading account to cover for any increase in SPAN+Exposure margin when exchange updates their margin sheet. This generally happens when your MTM loss+cash in trading account does not cover SPAN margin. Margin shortfall usually doesn’t happen during market hours, since broker does not allow you take positions without sufficient margin. This happens either when your MTM loss increases heavily or when exchange updates margin after market hours due to increased volatility (volatility is an input parameter to SPAN model).
Debit balance is when you have sufficient enough margin to hold all your overnight positions, but the margin you have is not in exchange stipulated margin form. exchange wants all traders to maintain atleast 50% of margin in cash equivalent form. in case you have total collateral margin > margin requirement, but do not have 50% of margin requirement in cash equivalent (either cash in trading account or liquidbees), margin call is not issued. But deficit cash balance is charged at 18% annualized interest.
case 1 : this is not debit balance. but if margin file is updated after you entered your position and SPAN margin is increased and increase in SPAN > 2000 MTM loss, then margin call is issued and you need to fund your trading account with shortfall (SPAN increase-[MTM loss]). If SPAN increased is less than MTM loss, no margin call and no need to fund you a/c.
case 2: liquid bees collateral is no different from cash in trading account. so no debit balance. in case you have pledged 1 lac worth equity for collateral and since, 50% isn’t in form of liquidbees or cash in trading account, you will be charged interest on 50% of collateral margin.
However, it is always better to maintain cash in trading account to atleast cover your MTM swings, to avoid your broker from liquidating your pledged equity or liquidbees, in case SPAN margin is increased.
But there may be a case when both margin call and debit balance may get issued.
need @nithin @siva @VenuMadhav to clarify on that special case.