Restrict user for changing and release budget for level 1 WBS

HI Experts,

Can anyone help me through this -

I want to restrict some user to change in level 1 wbs budget either original or release.

For e.g.

below is the WBS structure of my project

C-15TST01

C-15TST01-01

  C-15TST01-01-01

  C-15TST01-01-02

C-15TST01-02

  C-15TST01-02-01

So I want if user can only distribute the budget from root WBS to child WBS but can not change the budget in root WBS in CJ30 or CJ32 transaction.

Any suggestion will be appreciated.

Thanks