Thanks to David , who pointed me a node for process that makes Intercompany settlement easy.
For more details , here are the link:
- http://davidhaimes.wordpress.com/2007/12/05/intercompany-reconciliation-reports-just-got-interactive/ 
- http://davidhaimes.wordpress.com/2008/02/01/using-bip-for-interactive-reconciliation-reports/ 
A note on "Reconciliation process"
Reconciliation process is automated to easily reconcile intercompany receivables and intercompany payables account balances. The process helps user to identify account balances difference and to research the cause of difference. The reconciliation process supports drilldown to General Ledger journal details and subledger transaction details to investigate the reason of balance difference. The underline report have capablity to show:
- Details by Reconciliation Summary
- Details Reconciliation Summary by Source
- Details Reconciliation Summary by Journals