Solution : https://service.sap.com/sap/support/notes/780033 (SAP Service marketplace login required)
Key words : 
sapbwnews bw support package 10 netweaver'04 stack 10, 10 content            import support package 19, 0b            import support package 25, 50            import support package 10, 1 content support package 19, 0b support package 25, process chain reason, sapbwnews bw 3, support package, 10 support package 19
Related Notes : 
       
| 785840 | Multiple change runs are started simultaneously | 
| 763336 | SAPBWNews BW Support Package 10 NW '04 Stack 10 RIN | 
| 730980 | Realignment run blocked when started | 
| 723261 | SAPBWNews BW 3.1 Content Support Package 19 | 
| 723254 | SAPBWNews BW 3.0B Support Package 25 |