109.—(1) Where the parties to a legal charge which is a registered charge or which is a registrable disposition have agreed a maximum amount for which the charge is security, the proprietor of the registered charge or a person applying to be registered as proprietor of the registrable disposition may apply to the registrar for such agreement to be entered in the register under section 49(4) of the Act.
(2) The application must be made in Form CH3.
(3) The registrar must make an entry in the register in such terms as he considers appropriate to give effect to an application under this rule.