Section 162 of the Real Property Act 1886 (SA) forbids the registration of a beneficial interest on title, however it does allow for a trust instrument to be deposited.

This section reads:

The Registrar-General shall not, except as aforesaid, make any entry in the Register Book of the particulars of any trust, nor shall any instrument be registered under this Act, which declares or contains trusts relating to land under the provisions of this Act, but any such instrument, or a duplicate or attested copy thereof, may be deposited with the Registrar-General for safe custody and reference, and such instrument may be deposited in the General Registry Office pursuant to the Registration of Deeds Act 1935...