Division 4 For the purpose of this paragraph:

• ‘motor vehicle parts’ means parts falling within Chapter 87 of the Combined Nomenclature in force during the reference period;

• ‘aircraft parts’ means parts falling within Chapter 88 of the Combined Nomenclature in force during the reference period.

For motor vehicle and aircraft parts:

1. (a)

   the reporting units may report the statistical information on the commodity at the chapter level of the Combined Nomenclature in force during the reference period;

2. (b)

   Member States may exempt the reporting units from providing the statistical information on the quantity of the goods. In this case, Member States shall estimate the net mass not collected from the reporting units.