Solution : https://service.sap.com/sap/support/notes/1378417 (SAP Service marketplace login required)
Key words :
override existing sap delivered entries, add customer specific menu items, sap delivered items, adjust existing entries, standard delivered menu, prerequisites enhanced flexibility, terms menu, customer tables, menu enhancements, customer namespace
Related Notes :
| 1380510 | No default data delivered out-of-box in VC_GRFNMENUC |