wwv_flow_fnd_user_api.edit_fnd_user requires ADMIN privilege to perform this operation

We have a button on a page available to workspace administrators.  There is a page process linked to the button.  The page process deletes records  from some custom tables related to the user to be "deleted".  The following API is used to edit the user's account, but after clicking the button as a workspace administrator we get an error indicating that the user requires ADMIN privilege to perform this operation.

wwv_flow_fnd_user_api.edit_fnd_user(p_user_id =>:P48_USER_ID,
                                    p_user_name => v_user_name,
     p_end_date                     =>SYSDATE,
     p_description                  =>v_description,
     p_account_locked               =>'Y');