multiple RFC call in one PI meassage

Hi Experts,

Mine sender is  SAP Rfc and Receiver is file.

where 5 RFC/Bapi call triggers at a time and need to collect all the data in one message in PI then 1 file need to create on target.

for this what is the approach. how many program IDs need to create and RFC destinations? is there any way to built this with out using BPM?

Thanks,