Advance ruling applications: scope limited to classification, notification applicability, valuation, credit, liability, registration and supply. An applicant may obtain an advance ruling by applying in the prescribed form with the required fee, stating a specific question limited to: classification of goods or services; applicability of a notification; determination of time and value of supply; admissibility of input tax credit; determination of liability to pay tax; whether registration is required; or whether an act amounts to a supply within the meaning of the Ordinance.