Table for Getting details of the Certified Notification

Hello,

I have a requirement to fetch the certifying details of given Notification Number. That is i need to fetch who has certified the Notification and at what time and all other corresponding details for a Notification.

Am already using  the using the class  cl_notification_wps, as below

DATA : lcl_notification TYPE REF TO cl_notification_wps.

     CREATE OBJECT lcl_notification

       EXPORTING

         qmnum = lv_qmnum.

     CALL METHOD lcl_notification->get_certification

       IMPORTING

         et_steps      = lt_steps

       EXCEPTIONS

         not_certified = 1

         OTHERS        = 2.

But this method does not give the details about the certification.Am i going wrong anywhere.

Also is there any other table which will provide the certifying details. Will be very helpful if i could get a solution on this.

Regards.