Solution : https://service.sap.com/sap/support/notes/494086 (SAP Service marketplace login required)
Key words : 
/400 db4 db2/400 sql break cancel transaction reason, dbs/db4/allow_cancel profile parameter, dbs/db4/allow_cancel = 1since, windows nt application servers, 3-tier environment remains unaffected, interactive dialog work process, dbs/db4/allow_cancel = 1, solution cancelling database operations, cancel database operations, profile parameter set
Related Notes : 
       
| 705887 | DB4: Correction: SQL Cancel Default in 3-Tier | 
| 484548 | iSeries: 3 tier system installation |