* Says shareholders rejected its 1.9 billion euros ($2.14 billion) investment programme for 2018-2027 at a meeting on Tuesday. * Says shareholders requested that further information regarding investments and affordability be added to the plan. * Investment plan included works on a natural gas pipeline backed by the European Union to connect Bulgaria , Romania, Hungary and Austria (BRUA). Then three phases of building BRUA are estimated to cost 479 million euros, 69 million euros and 530 million euros, respectively. * Investment plan also includes domestic pipeline meant to transport future gas from offshore perimeters in the Black Sea , worth 360.4 million euros.