Section 12(1)(f) in The M.P. Civil Services (General Conditions of Services) Rules, 1961
(f)If the period of probation of any direct recruit or the testing period of any promotee is extended, the appointing authority shall determine whether he should be assigned the same seniority as would have been assigned to him if he had completed the normal period of probation testing period successfully, or whether he -should be assigned a lower seniority.