Solution : https://service.sap.com/sap/support/notes/1489967 (SAP Service marketplace login required)
Key words :
sort values, sorting option, properies dialog, frontend sp, bex analyzer, sorting reason, structures defined, columns/rows, prerequisites, conditions
Related Notes :
| 1378796 | Disabled Sorting when there is one struct. in the drilldown |
| 1332267 | BExAnalyzer: changes in cell properties dialog / sorting |