Solution : https://service.sap.com/sap/support/notes/186536 (SAP Service marketplace login required)
Key words :
additional key words drilldown reporting, hierarchy lists, vertical lines, lead column, error occurs, hierarchy level, line display, blank lines, level list, program error
Related Notes :
| 371048 | Drilldown reporting: characteristic disply in reports (docu) |
| 180429 | Drilldown report: MESSAGE_TYPE_X for hirarchy/print |