In this Chapter, unless the context otherwise requires,

(b). "case" means any proceeding under this Act or any other Act for the levy, assessment and collection of customs duty, pending before an adjudicating authority on the date on which an application under sub-section (1) of section 127B is made:

Provided that when any proceeding is referred back by any court, Appellate Tribunal or any other authority, to the adjudicating authority for a fresh adjudication or decision, as the case may be, then such proceeding shall not be deemed to be a proceeding pending within the meaning of this clause;