Give every Declaration of Conformity your own unique custom ID number.
Provide the product name(s) and model/type number(s) you want to include in this Declaration of Conformity.
Provide the name of the company that issues the Declaration of Conformity.
List the CE directive(s) you declare the product(s) to be in compliance with.
List the standard(s) you declare the product(s) to be in compliance with.
What is requested is the number of the certificate of the product, not a number of a certificate of one particular component.
Title of the person signing the Declaration of Conformity