File to AbapProxy for trigerring abap report

Hello PI/PO Experts,

I have to trigger Abap treatment in SAP ECC when receiving files from senders systems, using SAP PI.

In a classical approach : an externel scheduller like $U or VTOM working in pooling mode detectes new file in target directory and trigger an SAP ECC abap report, transfering file name in dedicated Abap parameter. And i don't need any more SAP PI to do this work....

In my SAP PI approach :

i don't have any external cheduller but i want to trigger SAP ECC abap treatment using this file

=>does the only way to solve it is to use a "File to ProxyAbap" scenario ?.

=>Is there any technical limits with this approach (maximum file size for example) ?.

Thanks a lot.

Etienne