Qualifying asset is a financial instrument that gives the holder the right to put the instrument back to the issuer for cash or another financial asset or is automatically put back to the issuer on the occurrence of an uncertain future event or the death or retirement of the instrument holder.
Qualifying asset is specifically discussed in IAS 32 Financial Instruments: Presentation.
Source: Glossary of Terms of IFRSs as at 31 December 2008.