Replication from R3 to CRM

I want to pull master data(Customer ) from R3 to CRM

We are using CRM 4.0 .

I tried through IDoc but the Message type DEBCOR is not available in CRM .Is there any similar message type which we can use in place of DEBCOR or any other approach .

Awaiting for response .

Edited by: Sunil Nair on Jan 15, 2008 2:02 PM