To EXCHANGE data between ECC ( R3 ) and CRM systems we need to maintain connectivity for both systems. Please ask your Basis consultant to do the following configuration. Maintain Logical Systems in both systems and link with respective clients. Maintain RFC destinations in both systems pointing to each other system. Maintain Number ranges as mirror IMAGES in both systems. Ex: Maintain same number RANGE in ECC as Internal and in CRM as External or vice versa. Below are the steps for the integration between R 3 & CRM :

SAP ECC :
1) Define logical system for ECC ( NAME ) .
2) Define logical system for CRM ( To establish the cross connection ).
3) Identify the data which you wanted to COPY to crm.
4)Assign logical system to the client.

SAP CRM :
1) Define logical system for CRM.
2) Define logical system for ECC.
3) Assign logical system to client.
4) Copy the required data from ECC.

To exchange data between ECC ( R3 ) and CRM systems we need to maintain connectivity for both systems. Please ask your Basis consultant to do the following configuration. Maintain Logical Systems in both systems and link with respective clients. Maintain RFC destinations in both systems pointing to each other system. Maintain Number ranges as mirror images in both systems. Ex: Maintain same number range in ECC as Internal and in CRM as External or vice versa. Below are the steps for the integration between R 3 & CRM :

SAP ECC :
1) Define logical system for ECC ( Name ) .
2) Define logical system for CRM ( To establish the cross connection ).
3) Identify the data which you wanted to copy to crm.
4)Assign logical system to the client.

SAP CRM :
1) Define logical system for CRM.
2) Define logical system for ECC.
3) Assign logical system to client.
4) Copy the required data from ECC.