BW: Copy SOURCE_PACKAGE to an internal table in start routine

Hello all

In BW I have the requirement to store all data of SOURCE_PACKAGE into an internal table. Then I would like to count duplicated entries (except RECORDMODE).

In my start routine of the transformation I started with

LOOP AT source_package ASSIGNING <source_fields>.

But how can I go on?

Thanks in advance.

Regards

Yvonne