FBCJ in display mode only

Hi

I want to restrict transaction FBCJ(Cash journal) in display mode only.

I created a test role and added only FBCJ Tcode.

At object level (F_FBCJ), I maintained as below

Activity 33(Read)

Authorization Group * (only * selection is posible)

When this role is attached to a user( he has only this role), he is still able to change and save cash journal.

What to do to give display access only ?

Manoel