Solution : https://service.sap.com/sap/support/notes/920027 (SAP Service marketplace login required)
Key words :
sap global support, field gstru equals, calculate proportional factors, characteristic selection blank, e-table reason, transaction mc9a - run, existing characteristic combinations, lowest hierarchy level, lowest planning level, running transaction mc9a
Related Notes :
| 841358 | FAQ: Flexible Planning |
| 500600 | Regenerating planning hierarchy |