How to restrict user to edit custom PO text only

Hi MM folks,

I would like to maintain PO Header Custom text for specific group of users. They are not allowed to change any other PO text for e.g. (Header Text, Header Note, Header Delivery Text, Terms and Conditions)

ME24 is good to maintain supplements only. But How I can restrict the users to enter/change only one custom text?

I already checked EVO, EFB parameters. I already copied ME22N/ME23N and allowed to edit text but again it is opening all PO texts which are not required.

Thanks,

Shah Yan.