Ann: Notice of Change of Interests of Substantial Holder for MEP, page-37

Scrip for scrip rollover | Australian Taxation Office (ato.gov.au)

Quote from 3/4 of the way down the page, but the whole page is relevant.
"The rollover allows you to disregard the capital gain made from the original shares, units or other interest. You are taken to have acquired the replacement shares, units or other interest for the cost base of the original interest.

You can apply the CGT discount when you dispose of new shares providing the combined period that you owned the original shares and the new shares is at least 12 months. The same applies to units in a trust. Note that you have to deduct any capital losses (including unapplied net capital losses from earlier years) from your capital gains before applying the CGT discount.

You may only be eligible for a partial rollover if you exchange shares, units or interests for similar interests in another entity (replacement interest) plus something else, usually cash."