ICSLS entitlement calculation eg: SCOMI-LA

If you have buy ICSLS (irredeemable convertible secured loan stocks), how does the % coupon entitlement calculation?

Here is the formula:-
{(Quantity x coupon rate)/frequency of pymt } x par value x tax

Eg: SCOMI-LA, if you have 20000 shares, Coupon of 4% per annum ICSLS, you will entitled for RM19.94.
{(Quantity x coupon rate)/frequency of pymt } x par value x tax
{(20000 x 4%)/4 } x 0.1 x 0.997 = RM19.94