Merely because a Government servant has been sent on deputation from one state to another, does not mean that he is not subject to the rules of the parent state. In an appropriate case, the parent state can exercise its control over that government servant. From what you have mentioned in your limited facts, it appears that such government servant was suspended by the parent state government on the basis of some misconduct that perhaps occurred during the period when he was earlier working in the parent state. In such circumstances, it would be within the powers of the Government of the parent state to suspend him and initiate disciplinary action against him.
As an example, the judgment of the Supreme Court in the case of Khemi Ram v. State of Punjab, (1976) 3 SCC 699 : AIR 1976 SC 1737, may be seen.
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