Set and Get parameters using SAP memory.

I have an ALV grid list that I want to transfer to a detail report when the user doubleclicks. I have set up a parameter transaction associated with the detail report. My problem is the transfer does not take place. After the "CALL TRANSACTION" the ALV grid list refreshes with none of the previous select-options being used. Is there further setup I need to do, or is my coding incorrect? All of the parameter fields have valid values. I am new to ABAP, so please be fairly specific with you answer.
ALV Grid code:
form user_command using r_ucomm     like sy-ucomm
                        rs_selfield type slis_selfield.
case r_ucomm.
    when '&IC1'.
      read table gt_data index rs_selfield-tabindex into gt_data_drilldown.
      set parameter id 'LIF' field gt_data_drilldown-lifnr.
      set parameter id 'BLN' field gt_data_drilldown-belnr.
      set parameter id 'CHK' field gt_data_drilldown-chect.
      set parameter id 'BES' field gt_data_drilldown-ebeln.
      set parameter id 'BSP' field gt_data_drilldown-ebelp.
      set parameter id 'MAT' field gt_data_drilldown-matnr.
      set parameter id 'WRK' field gt_data_drilldown-werks.
      call transaction 'ZRVRAD' and skip first screen.
endcase.
endform.
Detail report code:
start-of-selection.
all fields are in DATA stmts.
get parameter id 'LIF' field lifnr.
get parameter id 'BLN' field belnr.
get parameter id 'CHK' field chect.
get parameter id 'BES' field ebeln.
get parameter id 'BSP' field ebelp.
get parameter id 'MAT' field matnr.
get parameter id 'WRK' field werks.
end-of-selection.
write:/1 sy-vline,
        lifnr under 'Vendor #',
        35 sy-vline,
        belnr under 'Invoice #',
        50 sy-vline,
        chect under 'Cheque #',
        65 sy-vline,
        belnr under 'PO #'.
uline.
uline.
write:/1 sy-vline,
        chect under 'Item #',
        90 sy-vline,
        matnr under 'Material #',
        105 sy-vline,
        werks under 'Plant'
Thanks in advance for your help - Jim

Thanks for the replies.
Problem was resolved with submit report. Code is below:
Calling ALV List program:
FORM user_command USING r_ucomm LIKE sy-ucomm
 rs_selfield TYPE slis_selfield.
CASE r_ucomm.
 WHEN '&IC1'.
 READ TABLE gt_data INDEX rs_selfield-tabindex INTO gt_data_drilldown.
 SET PARAMETER ID 'LIF' FIELD gt_data_drilldown-lifnr.
 SET PARAMETER ID 'BLN' FIELD gt_data_drilldown-belnr.
 SET PARAMETER ID 'CHK' FIELD gt_data_drilldown-chect.
 SET PARAMETER ID 'BES' FIELD gt_data_drilldown-ebeln.
 SET PARAMETER ID 'BSP' FIELD gt_data_drilldown-ebelp.
 SET PARAMETER ID 'MAT' FIELD gt_data_drilldown-matnr.
 SET PARAMETER ID 'WRK' FIELD gt_data_drilldown-werks.
 SUBMIT zco_rpt_vra_detail AND RETURN.
 IF sy-subrc <> 0.
 ENDIF.
ENDCASE.
ENDFORM. "user_command
Called program zco_rpt_vra_detail:
START-OF-SELECTION.
GET PARAMETER ID 'LIF' FIELD lifnr.
GET PARAMETER ID 'BLN' FIELD belnr.
GET PARAMETER ID 'CHK' FIELD chect.
GET PARAMETER ID 'BES' FIELD ebeln.
GET PARAMETER ID 'BSP' FIELD ebelp.
GET PARAMETER ID 'MAT' FIELD matnr.
GET PARAMETER ID 'WRK' FIELD werks.
END-OF-SELECTION.
WRITE:/1 sy-vline, 'Vendor', 20 sy-vline, 'Vendor #', 35 sy-vline, 'Invoice #',50 sy-vline,
 'Cheque #', 65 sy-vline, 'PO #', 80 sy-vline, 'Item #', 90 sy-vline,
 'Material #', 105 sy-vline, 'Plant'.
ULINE.
WRITE: 'MyVendor' UNDER 'Vendor', lifnr UNDER 'Vendor #', belnr UNDER 'Invoice #',
 chect UNDER 'Cheque #', ebeln UNDER 'PO #', ebelp UNDER 'Item #', matnr UNDER 'Material #',
 werks UNDER 'Plant'.

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