Call my customized program in the Journal Entry

I would like to call my customized program in the Journal entry(fb50).

My program is:

REPORT  ZFILETEST.

CALL FUNCTION 'ARCHIVFILE_CLIENT_TO_SERVER'

  EXPORTING

    path            = 'D:\HP R2R\Setup\Java_SAP_Integration.pdf'

  TARGETPATH      = 'E:\usr\sap\OF1\tmp\Java_SAP_Integration.pdf'

EXCEPTIONS

  ERROR_FILE      = 1

  OTHERS          = 2

          .

IF sy-subrc <> 0.

MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO

        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.

ENDIF.

I developed a program that could upload the pdf file in the application server path.Once file has been uploaded in the server that needs to be linked/associated with newly creating Journal voucher(SAP doc id) of the tranactions in the Financial accounting group.

I want to associate the customized program to the FB50(as similiar to the attachments given)