Solution : https://service.sap.com/sap/support/notes/612446 (SAP Service marketplace login required)
Key words :
menu path 'goto' -> 'text elements' -> 'text symbols', create text symbol '018', text 'descriptions saved, line item display, execute report rf_convert_fblx_line_layouts, started report rf_convert_fblx_line_layouts, display report rf_convert_fblx_line_layouts, text symbol, sap release 4, earlier release
Related Notes :
| 370940 | Line item: Upgrade of line layout variants |