SAP CRM  Middleware flow from R/3 to CRM

hi
I am new to CRM middleware   I have some doubt about the replication from the R/3 to CRM.
I have some 4 basic questions Kindly help me out
1.in initial  down lode how to know which object for which requirement? There is any list like these objects for this one?
2.when the initial download have to use and when the delta down lode have to use?
3.object creating is preferable option or not if yes in which condition we have to create the objects?
4.what is the difference between   customizing objects and business objects?  and when we have to use which object ?
wiht Regards,
prakesh..!

Hi Prakesh
Happy to hear that my answers were useful. Hope this new will solve your problem.
So let's reply to your new questions.
1)  Yes it is the delta download. This means that you have already triggered the initial download. Now all changes or new creations are replicated into the CRM system. I do not suggest this approach. This is usually used when you have no other chance because this process is complex and very time consuming. I would suggest checking the BDoc before proceding with degugging the queue. Go to transaction code SMW01. Filter on time (when you made the change). You will find bdocwith a red or yellow traffic light. This means that data have been not processed in CRM system. You usually have an error message (just select the BDoc from the list and click the red button in the toolbar) attached to the BDoc that is explainatory of the error. Correct the error and reprocess the BDoc (there is a proper button).
2) To debug the queue go to transaction code SMQS and SMQR and deregistrate inbound and outbound queue in the CRM system. After you do this, apply the changes to the customer. You will find an inbound queue in transaction code SMQ2. Select the queue and click the last button in the header toolbar. You will process the flow in debug. Remember to register the queue when this is no more necessary otherwise you will have a mess in the system.
3) if you create new customer in CRM system, this are automatically replicated in the backend system basing on the scenario set. No additional tables are created. All the changes applied in the CRM system will be replicated in the backend with the same process except the Bdoc that are really CRM specific.
Hope this help you.
Regards,
Fabrizio

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