Release strategy: User should release only with his highest release code

Hello,

Because of personel absences we want to configure the release strategy so that:

User A or user B releases in the normal case the first level of a PO (with release code 01).

User C (Manager) releases after release code 01 with release code 02.

User A is deputy of user C. In this case user B will release with code 01 and user A will release with code 02.

Because user A can use depending of the case release code 01 or 02 (C deputy) it must be avoided that user B sets release code 01 and 02 for the same purchase order.

Do you know about a solution for this issue

Br

Manuel