Adding custom field in output of report IH01

We have a requirement to add custom fields in output of report IH01.

I have added fields to an append structure of RIHSTPO, which is visible in the output of report.

But the BADI BADI_EAM_MULTILEVEL_LIST is not getting triggered while executing report IH01.

Kindly suggest where can I add logic to the custom fields added in output of report.

Regards,

Ashwini