SOAP Loopback scenario for receiver Sync Scenario

[#1]

Hi Experts,
I am developing a Mail to Sync RFC scenario. In the target, the source message needs to be split into multiple messages and I am using multi-mapping. As Sync interface does not support multi mapping, I am trying to use the SOAP Loopback scenario described in the blog below -

https://blogs.sap.com/2015/01/28/multi-mapping-with-dynamic-configuration-soap-loopback-approach/
But, I am not able to map the Abstract out bound Async interface to inbound Sync interface in the 2nd iFlow.

My requirement is similar to the one explained in the thread below -

https://archive.sap.com/discussions/message/16961685#16961685

Could you please advise how to get around this requirement ?

Thanks

Sugata Bagchi Majumder