SOAP to RFC sync scenario

Question

Hello members:
we have a business scenario: SOAP to RFC sync
an external system (ABC) sends documentrequest thru XI SOAP adapter and makes an RFC call to a BAPI and gets back the resposne to the ABC system.we are handling 4 mappings. 1. request msg to a common msg 2. common msg to BAPI request3.bapi response to common msg 4. common msg to response msg(which is same as the req msg)
i have the request msg and common msg as external definitions. I did the following steps and wanted to
know if i am right.
1. there are no data type & msg type needed for this
2.  4 msg interfaces
i)  document o/b sysnc
ii) document i/b sync
iii)common o/b sync
iiii) common i/b sync
3) 4 mappings
i) document to common
ii) common to bapi req
iii) bapi resp to common
iiii) common to req/response
4) 3 intf mappings
source intf**********               target intf
i)document o/b               common o/b uses mapping #1
ii)request :common i/b         bapi i/b  uses mapping #2
   resposne:bapi i/b           common i/b uses mapping #3
iii) common i/b             document i/b uses mapping # 4
pls provide your inputs if my approach is rite? do i need to have 4 msg intefaces?has any made mappings where 4 mappings are involved ( without BPM)
Thanks in advance

Answer 1

Hi,
I think you will have only 2 interfaces.
1. Sync Outbound interface (SOAP Structure)
    Two message types Req and Res
2. Sync Inbound interface (RFC Structure)
    Two message types Req and Res
Then two message mapping
1. SOAP Request  to RFC Request
2. RFC Response to SOAP Response
and finally one Interface mapping.
Thanks,
Prakash