User's edit permission

Hi, my audit just asked about that is it possible for setting the user’s edit permission in a specific field.
eg. User A : can edit the custom field but cannot edit the amount/reference in Receipts & Payments.
thank you.

No. If a user can edit a transaction, all fields can be edited.

Thank you for your reply Tut.
We have a problem that our staffs want to copy the transaction but instead of copping they “edit” that transaction.
We limit the user permission to create and view to prevent this kind of problem but some of the customs fields need to update after posting.

Do you have any idea about this?
Thank you in advance.

The solution is better training.