How can I configure iDoc collection in SAP Process Integration?

There are two steps to do to configure outbound iDoc collection.

The first step is to provide iDoc package size in partner profile transaction we20 in ABAP stack. The second step is to configure the sender communication channel to handle ‘Multiple iDocs in single XI Message (or IDOCXML)’ in IDOC_s window -> Adapter-Specific tab -> RFC parameters in the Process Integration stack.