Solution : https://service.sap.com/sap/support/notes/795076 (SAP Service marketplace login required)
Key words : 
type' - data type 'char' - length '1', sapbwnews bw sp11 netweaver'04 stack 11, 10 content            import support package 20, 0b            import support package 26, 'elementary type' - 'built-, 50            import support package 11, data element rsfo_dummy, 1 content support package 20, syntax error occurs, provide correction instructions
Related Notes : 
       
| 872193 | Error in the formula compiler | 
| 763338 | SAPBWNews BW Support Package 11 NW'04 stack 11 RIN | 
| 723262 | SAPBWNews BW 3.1 SP Content 20 | 
| 723257 | SAPBWNews BW 3.0B Support Package 26 |