Solution : https://service.sap.com/sap/support/notes/1379661 (SAP Service marketplace login required)
Key words : 
solution sap netweaver bi 7, sap netweaver bi 7, sap nw bi7, 01 bi abap sp06, 02 bi abap sp02, symptom convt_no_number occurs, terms formula variable, sapbinews nw bi 7, 00            import support package 23, import support package 06
Related Notes : 
       
| 1369212 | SAPBINews NW 7.01 BI ABAP Support Package 06 | 
| 1367864 | SAPBWNews NW BW 7.11 ABAP Support Package 04 | 
| 1367799 | SAPBINews NW7.0 BI ABAP Support Package 23 | 
| 1263838 | ABEND RS_EXCEPTION accessing documents from Bex in JAVA | 
| 1260071 | SAPBINews NW 7.10 BI ABAP Support Package 08 |