See SAP Note 2635096 - Similar journal Entry functionality is not active in Fiori App "Manage Journal Entries" -> https://userapps.support.sap.com/sap/support/knowledge/en/2635096
Thanks for the information.
Regarding the second section (maintenance of Condition tables), see also OSS note 2249374 "Overhead rate customizing: Customer-specific dependencies" which describes the limitations of the approach as well as user-exit wo...