(107)It is necessary to clarify the conditions under which modifications to a contract during its performance require a new procurement procedure, taking into account the relevant case-law of the Court of Justice of the European Union. A new procurement procedure is required in case of material changes to the initial contract, in particular to the scope and content of the mutual rights and obligations of the parties, including the distribution of intellectual property rights. Such changes demonstrate the parties’ intention to renegotiate essential terms or conditions of that contract. This is the case in particular if the amended conditions would have had an influence on the outcome of the procedure, had they been part of the initial procedure. Modifications to the contract resulting in a minor change of the contract value up to a certain value should always be possible without the need to carry out a new procurement procedure. To this effect and in order to ensure legal certainty, this Directive should provide for de minimis thresholds, below which a new procurement procedure is not necessary. Modifications to the contract above those thresholds should be possible without the need to carry out a new procurement procedure to the extent they comply with the relevant conditions laid down in this Directive.