(i)

in the case of additional deliveries which are intended either as a partial replacement of normal supplies or installations or as the extension of existing supplies or installations, where a change of supplier would oblige the contracting authority to acquire equipment having different technical characteristics which would result in incompatibility or disproportionate technical difficulties in operation and maintenance; the duration of such contracts may not exceed three years;

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Source: EUR-Lex (Cellar) · retrieved 2026-11-04 · Text as adopted (Official Journal); later amendments are not incorporated in this text.