The condition of three years service as SO on deputation basis is applicable to the officers of Autonomous body/corporation only because this condition is separated by "OR"...So please read carefully and try to understand in depth. I have also discussed this rules position with various people having LLB/LLM degree and legal background. They told that various symbols such as , / or change the meanings of whole scenario. So in this case, the condition of "or" is separating the sentence so condition of three years service as SO is applicable to autonomous/corporations' officers only.