7.27B A listed issuer may not undertake a rights issue, open offer or specific mandate placing that would result in a theoretical dilution effect of 25% or more (on its own or when aggregated with any other rights issues, open offers, and/or specific mandate placings announced by the issuer (i) within the 12 month period immediately preceding the announcement of the proposed issue or (ii) prior to such 12 month period where dealing in respect of the shares issued pursuant thereto commenced within such 12 month period, together with any bonus securities, warrants or other convertible securities (assuming full conversion) granted or to be granted to shareholders as part of such rights issues, open offers and/or specific mandate placings), unless the issuer can demonstrate that there are exceptional circumstances (for example, the issuer is in financial difficulties and the proposed issue forms part of the rescue proposal).