Under which provision of the Code of Civil Procedure, 1908, can the restoration or setting aside of orders passed ex-parte be sought regarding an application filed under Order XXI which has been dismissed for non-appearance or decided ex-parte?

Under Section 113 of the CPC, a Reference can be made to the High Court during the pendency of a case when:

The purpose of ________ is to enable subordinate courts to obtain, in non-appealable cases, the opinion of the High Court on a question of law and thereby avoid the commission of an error which could not be remedied later.