By way of derogation from Titles I and II, where a contract covers both services covered by Article 346 of the Treaty on the Functioning of the European Union and services covered by the ordinary law of contracts set out in Book I of Part Two, Book II relating to partnership contracts or Book III relating to defence or security contracts or the ordinary law of concession contracts set out in Book I of Part Three, the contract is subject respectively to the special legal regime applicable to other public contracts provided for in Book V of Part Two or to other concession contracts provided for in Book II of Part Three, provided that the award of a single contract is justified by objective reasons.