Solution : https://service.sap.com/sap/support/notes/581218 (SAP Service marketplace login required)
Key words : 
system writes change documents, initial load solution option 1, writing change documents, source code corrections, import large datasets, change documents, initial load, crm server, terms bp_exchange_r3_to_crm, xif adapter
Related Notes : 
       
| 619012 | Migration:2.X to 3.X Collective note after 3.0SP14, 3.1 SP04 | 
| 594953 | Initial download performance IS-U/CCS - mySAP CRM | 
| 581107 | No update of change documents during initial download | 
| 580839 | Setting of the initial load flag for the CRM application | 
| 537486 | Composite SAP note:perfrmnce problms during initial download | 
| 493343 | Performance of initial data transfer via XIF adapter |