Section 13. Relinquishment of portion of claim

A plaintiff who has been called upon to pay additional fee may relinquish a part of his claim and apply to have the plaint amended so that the fee paid would be adequate for the claim made in the plaint as amended. The Court shall allow such application on such terms as it considers just and shall proceed to hear and decide the claim made in the plaint as amended, provided that the plaintiff shall not be permitted at any later stage of the suit to add to the claim the part so relinquished.