Overall speaking, it's simply this:-
If you plan to invest more money into Hektar, you may add 1.23 to each of the FREE RI given to you (if you are currently a Hektar shareholder) since this price is lower than current market price.

If you are not yet a Hektar shareholder, the RI or ex or whatever doesn't really matter. Just wait for a good price and buy, that's all. Don't even need to bother about the RI because when ex, the mother price will be adjusted accordingly. Just keep in mind that after RI fully converted into mother shares, the earnings will be diluted. I forgot dilution is how much already. Just remember the two new Malls has yield of 5-6% currently. But Hektar said they will spend I think 19m to make it nicer and pushes yield to 7%.

You don't have to sell the mother shares. You can just sell the RI given to you free in open market (normally got about 1 week time for you to do that, so keep close eyes to any news or letters mail to you). After earning from selling the RI, the ex-date price adjustment should be no harm to you, just see paper profit drop only.