Generally the authorization for cash journal is controlled by authorization object F_FBCJ. However, if you want that with in cash journal if the user should be able to post only certain specified kind of transactions, you can always create a validation rule in GGB0 depending on your specific requirement.
Normally, for casj journal the suggestion is to introduce segregation of duty. For e.g. the user who create and saves (for review, no document is posted at this point) the cash journal should not be allowed to post (SAP document will be posted) cash journal. Then another user should be assigned cash journal deletion auhtorisation shold related document required reversal. Basically, you should have authorisation for update, post and deletion in seprate user role.
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