EU texts often refer to the 'competent body', 'competent department or 'competent official', meaning the body, department or official that is responsible for the activity in question. For example:
Since more direct contacts between the authorities and officials of the Member States might be necessary for reasons of efficiency, the provisions on delegation and the designation of competent officials should also be maintained.
Do we use competent like this?
The OED gives: Law. Legally qualified or sufficient. While ODO gives: (Of a court or other body) accepted as having legal authority to deal with a particular matter.
Maybe the concept of 'other body' can be extended to include officials?