art_28__point_3__point_a__text_1
for additional deliveries by the original supplier 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/entity to acquire material having different technical characteristics which would result in incompatibility or disproportionate technical difficulties in operation and maintenance.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-11 · Text as adopted (Official Journal); later amendments are not incorporated in this text.