Solution : https://service.sap.com/sap/support/notes/1001257 (SAP Service marketplace login required)
Key words : 
sql statement terminates, complicated sql statement, saving input data, internal database buffer, parameter _mblock_data_size larger, solution maxdb version 7, database parameter _mblock_data_size, database parameter usevariableinput, internal buffer, database version 7
Related Notes : 
       
| 1027504 | Error '-1103, too complicated SQL Statement' | 
| 793550 | Supplementary info about the MaxDB version upgrade to 7.6 | 
| 767635 | MaxDB Version 7.5 parameter settings for OLTP/BW |