Paragraph 22
Subject to subparagraph (2), a relevant system must comprise procedures which provide that an Operator-instruction to a participating issuer relating to a right, privilege or benefit attaching to or arising from an uncertificated unit of a security, is generated only if it has—
received a properly authenticated dematerialised instruction attributable to the system-member having the right, privilege or benefit requiring the Operator to generate an Operator-instruction to the participating issuer; or
been required to do so by a court in the United Kingdom or by or under an enactment.
A relevant system must comprise procedures which provide that an Operator-instruction to a participating issuer relating to a right, privilege or benefit attaching to or arising from an uncertificated unit of a security, may be generated if necessary to correct an error and if in accordance with the rules made and practices instituted by an Operator in order to comply with this Schedule.