Hi Husain
Yes, it is possible to go with a ccBPM design too. I would have suggested that as an option if you have the REST adapter which supports sender polling. This would allow you to skip the ABAP proxy for triggering and have a full PI-based solution.
However, I suggested the ABAP based approach because:-
i) You need an ABAP program to trigger the interface since there is no REST adapter to poll
ii) Since you already need an ABAP calling program because of i), it'd be better to have the logic to filter the names there (from the sync response of the first call) instead of creating another RFC for it. This way, you just have one ABAP development object
iii) If it is possible to have more than 1 files that have not been downloaded, it will be easier to filter and make subsequent calls from ABAP rather than from PI/ccBPM.
iv) As you might know, ccBPM can be performance intensive and need to designed efficiently. This is not to mean ccBPM is to be avoided at all, but needs to be weighed accordingly on a case-to-case basis. Since this design can be achieved with ABAP, I would personally go for the ABAP-based approach.
Regards
Eng Swee