Yes, it is mandatory to mention all diplomas/qualifications required in order to apply for a selection procedure. 
The minimum requirements are listed in the Notice of Competition (available on the competition page). 

Please indicate only diplomas/qualifications that have been awarded by the application deadline. 
For the Graduates administrators (AD5) competition, the minimum requirements (only Bachelor) must be awarded by 30/09/2026.

The order is not important, the Selection Board will be able to sort the declared entries chronologically. 

Providing incomplete or false information may lead to exclusion from the selection procedure.