Hi Leandro,
You can use SOAP Lookup to avoid ccBPM implementation. You could go like below:
Web Service 1 (Request) --> A SOAP Lookup from UDF 1 (Synchronous Call to Web Service 2) --> B SOAP Lookup from UDF 2 (Synchronous Call to Web Service 3) --> RFC Request
RFC Response --> Web Service 1 Response
Refer: SOAP Lookup from UDF
Now SOAP Lookup one big disadvantage of monitoring and debugging at the time of failure. You have to keep that in mind. Also need to ensure two times SOAP call from UDF not creating any performance issue.
Regards,
Nabendu.