Problem in Workflow Activity from OLD System ( EHP6 ) to New Sys ( EHP7)

Hi,

As i have developed a Activity Step type in that i wrote the logic by using Abap Class in that method i have called a Standard Function module HRHAP_DOCUMENT_GET_DETAIL in that am passing the document id but i couldn't get the Values.

But its working fine in the Old system . But when i check in the New system its not working.

And also i put a Breakpoint in the Method and i have checked the values are coming properly From Workflow when i pass to FM and not getting the Record.

Here the Code.

***********************************************************************************

*** Function Module to Get the Appraisal Document Data

************************************************************************************
  ls_s_appraisal_id-appraisal_id = i_document_id.

  CALL FUNCTION 'HRHAP_DOCUMENT_GET_DETAIL'

    EXPORTING

      plan_version       = '01'

      s_appraisal_id     = ls_s_appraisal_id

    IMPORTING

      t_header_appraiser = lt_header_appraiser

      t_header_appraisee = lt_header_appraisee

      s_header_status    = ls_header_status

      s_header_dates     = lt_header_date

      s_return           = ls_return.

Kindly suggest.

Regards,

Sdaiq