Solution : https://service.sap.com/sap/support/notes/422118 (SAP Service marketplace login required)
Key words :
additional key words query, 0b import support package 17, 1c import support package 09, hierarchy node variables, 0b support package 17, 1c support package 09, bw support packages, support package, query navigation', 0b patch17
Related Notes :
| 399588 | Node variable 'Changeable during query navigation' |