BPM - doubt in N:1 mapping of IDOCs

Question

Is there any DETAILED document on Mapping multiple Idocs into a single Idoc package using BPM.My doubt is in the latter part in this process(During Receiver Determination) :
Scenario : CRM->XI->R3
We will download the CREMAS03 and then make changes in the xml so that it can hold multiple IDOCs.
and then we will be collecting the Idocs(say 3 idocs at a time)...that is, appending the IDOCS(CREMAS03) into a multiline container of type CREMAS03.
In the transformation step, the multiline container containing CREMAS03 IDOCs is transformed to IDOC PACKAGE(N:1 Mapping).
In Integration Directory,We will create 2 RECEIVER DETERMINATIONS :
1.CRM->BPM :
Receiver Service  :BPM Object
Inbound Interface :CREMAS
Interface Mapping :Maps the Outbound interface (vendor_out_interface) to CREMAS(Abstract Asynchronous)
2.BPM->R3 :(I have my doubt here!)
Sender Service     : CREMAS_COLLECT_PACKAGE(BPM Object)
Outbound Interface : CREMAS_package(Abstract Async, Message is the modified Multi-CREMAS PACKAGE)
Receiver Service   : R3
Inbound Interface  : CREMAS.CREMAS03
Interface Mapping  : NONE (WHY is that No Interface mapping is needed ???...Please elaborate)
1.HOW will the XI engine MAP the CREMAS_package to CREMAS.CREMAS03 at the end of BPM PROCESS ?
2.In BPM we have Transformed the individual Idocs into a IDOC Package BUT then at BPM->R3 Receiver Determination WHY are we mapping the CREMAS Package into Individual CREMAS Idoc ??
3.Does the R3 receive the IDOCs as a Package OR does it receive it as individual Idocs ?And when we say a Package does it mean it will contain 1 Control record & multiple Data Records(EDID) ??
4.If the R3 receives the IDOCs as a PACKAGE, THEN How does the R3 System separate the Idocs into Individual Idocs ??
Is there any specific configuration in the partner profile at the R3 side to process A IDOC package ??.
5.Also when I compare Posting Function Module IDOC_INPUT_CREDITOR and IDOC_OUTPUT_ORDERS , It seems that IDOC_INPUT_CREDITOR    can process multiple Idocs at a time while IDOC_OUTPUT_ORDERS CAN process only ONE IDOC at a time.Am I right ?)
It would be great if someone has the patience to give a detailed reply.Looking forward to the reply !!
Thanks,
Arun.

Answer 1

Hi Arun,
You dont need a BPM for ur requirement. All you need to do is IDOC Message pacakages. where the IDOC are sent as a single package. here is the link to the page that details on hwo to do idoc packaging.
http://help.sap.com/saphelp_nw04/helpdata/en/99/2653429392ab53e10000000a1550b0/content.htm
you also refer to Michals weblog on IDoc pacakaging. But the approach i have jsut mentioned to you is more efficent and the one suggested by SAP. Michel was supposed to write one more weblog describing this approach.
Cheers,
Naveen