My greetings to Vicky!
I don't know details of your environment, so following is only my approach to deal with your task.
Assume you have three components:
FILE_SRC - for sender
FILE_DST - for receiver
ERP_D - ABAP Proxy system
You should create objects at Directory:
ICo: |FILE_SRC|{dummy_namespace}dummy_large||
CC: |FILE_SRC|LargeFile_File_Send with EOIO, ASMA and File Splitting mode
CC: |FILE_DST|LargeFile_File_Recv with using ASMA
The idea is to set receiver determination rules as follows:
* Chunks ## 1..n-1 are not transported to ERP_D
* Last chunk is transported to FILE_DST and ERP_D
For traditional dynamic variables and context objects, there is full support for Receiver Determination, but for {http://sap.com/xi/XI/System/Generic}ChunkMode you have to write your own Enhanced Receiver Determination which will return either 'FILE_DST' or 'FILE_DST+ERP_D'.
As for last chunk processing, you have to implement especial operation mapping from {dummy_namespace}dummy_large to your ABAP proxy where to develop function checks adapter engine detail for transporting last chunk.
Because all chunks are subject of one EOIO queue, in my humble opinion the scenario is well-designed.