Solution : https://service.sap.com/sap/support/notes/326700 (SAP Service marketplace login required)
Key words :
system generates error message cj020, additional key words cj20n, 'superior' tab page, system reads cjdi_disp, billing plan data, wbs detail screen, system displays, classification data, cjdi_disp-index, wbs element
Related Notes :
| 389509 | CJ2B: Problems when you show/hide |