Section 6(2) in The Indian Police Service (Regulation of Seniority) Rules, 1988
(2)If a promotee officer is transferred from one cadre to another in public interest, his year of allotment shall remain unchanged and he shall be ranked inter-se with promotee officers having the same year of allotment in the cadre to which he is transferred with reference to the date on the basis of which he was assigned the year of allotment under these rules.
