Person in lien from one PSU to other PSU can be retain same seniority after returning to his parent PSU?

Kindly clarify whether the person in lien from one PSU to another PSU can retain the same seniority after returning to his parent PSU?

In such a situation, a lien on employment depends on the contract of employment. Unless otherwise provided, there is no lien on employment once the individual leaves the job. However, if the person was hired to fill a position due to the absence of a permanent employee and has to leave the job upon the latter's return, they may receive priority for employment when a new vacancy opens up. This right to employment will not be available in another PSU, but the individual can still list it as experience, which may be considered as a qualification rather than a guaranteed right.

Retaining lien in the previous company gives the person only an option to return back to that company. For any reason the employee wants to go back, if lien is retained, then the employee can resume duty in the post and pay last held by such employee. Protection of seniority is generally not allowed; it sounds improper and inappropriate unless it is specified to the contrary in the order on lien. So, on return to the previous organization, the seniority has to be reckoned again with continuity of service, blanking out the intervening period.