Solution : https://service.sap.com/sap/support/notes/493156 (SAP Service marketplace login required)
Key words : 
reorganize bdoc message related object links regularly, reorganizes bdoc message related object links, reorganize bdoc message related object links, middleware message processing creates object links, related components > reorganization > reorganize log, customer releationship management > crm middleware, bdoc message related object links, middleware reorganization reprot smo6_reorg2, middleware reorganization batch job, enter object type midmessage
Related Notes : 
       
| 908194 | Performance of RSRLDREL2 | 
| 853035 | New reorganization report for object relationships | 
| 790363 | Collective note for CDB Upgrade from CRM 3.X to CRM 4.0/5.0 | 
| 713173 | Update of the CRM Middleware reorganization SMO6_REORG | 
| 707820 | Performance: Object links and RSRLDREL | 
| 706478 | Preventing Basis tables from increasing considerably | 
| 675725 | Unnecessary BDocs in SRM (EBP) from queue CSA_MASS_BUPA | 
| 566765 | Deletion: Reducing read accesses to SRRELROLES | 
| 536414 | CRM 3.0/3.1 SAP Composite Note: Middleware reorganization | 
| 529867 | RSRLDREL does not delete all links | 
| 524647 | Performance: Parallel processing of the campaign execution | 
| 522329 | Reorganization of object links ignores BDoc messages | 
| 493076 | Reorg of BDoc related object links fails | 
| 360536 | Problems with Report RSRLDREL when deleting links |