Section 3(1)(b) in The Karnataka State Civil Services (Regulation of Promotion, Pay and Pension) Act, 1973
(b)only on the ground of his seniority in a seniority list, be promoted to any post or office unless the authority competent to promote determines his eligibility and promotes him by a written order to officiate in such post or office; and no such civil servant shall, save as provided in section 9, be entitled to continue in such promoted post or office unless the said authority assesses the work of such civil servant in such post or office and declares by a written order that he had satisfactorily completed his officiation ;