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Security permissions issue
Case is having a private security model.
Only case owners can change the data.
Here there is a requirement that case creator should be able to change one of the field and not the case owner.
How to go about with this?
If this is being done VF, I would personally compare your Case Owner(case.OwnerId) vs current user (UserInfo.getUserId()). If they don't match, then display save button. You can also do this via the validation rule as long as case.OwnerId == UserInfo.getUserId
The below article will describe the way to define the secuiry model for any object
How to design your application for multiple users?
Regards,
Satheeskumar
Puthuvannam Technology Solutions