Solution : https://service.sap.com/sap/support/notes/857918 (SAP Service marketplace login required)
Key words : 
sapbwnews bw support package 14 netweaver'04 stack 14, 10 content            import support package 22, 0b            import support package 28, enqueue function module, 1 content support package 22, 50            import support package 14, 0            import support package 04, ersreqdone lock object, 0b support package 28, sapbwnews bw 7
Related Notes : 
       
| 857401 | P28:P4: MON: High number of enqueue rejects in SM12 | 
| 836439 | SAPBWNews BW Support Package 14 NW'04 Stack 14 RIN | 
| 829624 | SAPBINews NetWeaver 7.0 BI Support Package 04 | 
| 796763 | P26: P40: Lock on RSMONICDP held 100 times in cumulative way | 
| 783252 | SAPBWNews BW 3.1 Content Support Package 22 | 
| 783170 | SAPBWNews BW 3.0B Support Package 28 |