Solution : https://service.sap.com/sap/support/notes/1428583 (SAP Service marketplace login required)
Key words : 
solution sap netweaver bw 7, calling method collect_s, terms cx_sy_dyn_call_illegal_type reason, plan buffer query, sap netweaver bw 7, sap nw bw7, type mismatch fault, 01 bi abap sp07, 02 bi abap sp04, check sap note 875986
Related Notes : 
       
| 1419541 | Preliminary version SAPBWNews NW BW 7.10 ABAP SP10 | 
| 1407599 | Preliminary Version SAPBWNews NW BW 7.20 ABAP SP03 | 
| 1407598 | SAPBWNews NW BW 7.0 ABAP SP 24 | 
| 1392433 | SAPBINews NW7.11 BW ABAP Support Package 05 | 
| 1369294 | SAPBINews NW7.01 BW ABAP Support Package 07 |