Ann: Announcement of Rights Issue, page-13

From the ASX guidelines: note the last sentence, could be your answer.
ex entitlementXE first displays for a security from the morning of the Ex Entitlement date (generally four business days before the record date) and remains until the close of business on application's close date. Trading in securities displaying XE on ASX Trade does not carry the right to securities in the entitlement issue. For more information refer to the description of cum entitlement. All orders are purged at the end of the trading day prior to the security being quoted on an XE basis.