Solution : https://service.sap.com/sap/support/notes/1012569 (SAP Service marketplace login required)
Key words : 
sap netweaver 2004s bi, persistent staging area, data element rsnodename, data element rsshnodename, hierarchy structure maintenance, release bi 7, loading data, hierarchy tables, hierarchy idocs, hierarchy format
Related Notes : 
       
| 1480438 | INcrease NODENAME from CHAR 32 to 60 | 
| 1376282 | Hierarchy node variable can be of length 60 | 
| 1173868 | Increase the NODENAME to 60. |