Solution : https://service.sap.com/sap/support/notes/1505121 (SAP Service marketplace login required)
Key words :
properties tab 'conversions' select, prerequisites missing functionality, permanent solution exists, execute transaction rscur, bex query designer, field target current, 'variable sequence' dialog, 'variable sequence' dialogs, unit translation factors, translation factor removing
Related Notes :
| 1643585 | Query Designer: variables in Currency and Unit Translations |