Division 8.9. and 10 VAT, Trader Identification and Legal registration numbers:

Enter the required numbers

The Trader identification Number(s) is (are) the identification number(s) registered by the customs authority(es)

The legal registration number is the registration number given by the company registration office.

If the numbers are the same, enter only the VAT ID number

If the applicant has no Trader Identification Number because e.g. in the applicant's Member State this number does not exist, leave the box blank.