To Restrict the Authorization to create new Version in ME22n for particular Users

Dear Experts,

In Me22n there is version Tab. When ever users are creating a new purchase order (PO) it is mandatory to create new version. But whenever there is a modification in Purchase order (PO) it is creating new version for the same PO. Moreover users want to create version by only particular user (MMAT3) but not by MMAT2 when they are performing modifications. Can i know the Authorization object related to version Tab in Purchase Order (PO) of Transactions (ME21n, ME22n,ME23n) to Restrict to MMAT2 Users. So,they will be restricted creating new version while when they performing modifications for the same PO.

I have monitored many Posts and forms to know the version tab object in above transactions. But I cannot find it to restrict. Please suggest me a solution to restrict.

Thanks,Regards,

Harsha.