Regarding ON CHANGE OF Statement

Hi,
I have made changes in Z program, user ON CHANGE OF statement on work area, when i go for print preview, it is showing line item at first time but when i go back & again go for print preview, line items are not getting print. In my development 220 system it is working fine but on 400 Quality server it is not working. Control is not going inside the ON CHANGE OF statement.
I am putting my code for your reference<Removed by moderator> .I am taking PO print preview through ME9F for particular Output type.
CLEAR : ls_serv_final ,ls_ekpo.
LOOP AT lt_serv_final INTO ls_serv_final .
      READ TABLE lt_ekpo INTO ls_ekpo WITH KEY
                             ebeln = ls_serv_final-ebeln
                             ebelp = ls_serv_final-ebelp .
      ON CHANGE OF ls_serv_final-ebelp .
        MOVE ls_ekpo-ebelp TO ls_serv_final-ebelp1 .
        MOVE ls_ekpo-txz01 TO ls_serv_final-txz01 .
        MOVE ls_ekpo-eindt TO ls_serv_final-eindt .
      ENDON .
      MOVE ls_ekpo-pstyp TO ls_serv_final-pstyp .
      MODIFY lt_serv_final FROM ls_serv_final TRANSPORTING ebelp1 txz01 eindt pstyp .
ENDLOOP .
Thanks & Regards,
Subhanshu Shrivastava
ABAP Consultant
Edited by: Vinod Kumar on Sep 8, 2011 1:53 PM

Hi abhi,
Thanks for your suggestion but all work areas & Internal Table are already clear & refresh at the beginning resp.
hi oki,
Thanks for your suggestion, but the logic provided by you will not work in my case because i need to print like given below:
Item           Material             Quantity   Item No    TRN No.      Delivery           Date                    Components          Quantity
00010    GA8-570001-7        32          0001      20110720                         19.07.2011           GA8-531022-11          32
00020    GA8_SEAT              10         0001       55555555                         29.08.2011          GA8_SEAT                  10
                                                 0         0002        2564777                                                      GA8-531022-11           3
                                                 0         0003        3100003                                                      GA8-570001-7             1
if any one has other solution please provide you suggasion.
Thanks & Regards,
Subhanshu Shrivastava

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Regarding ON CHANGE OF Statement

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