SMARTFORM GUI_DOWNLOAD PDF error opening Adobe document

Question

When attempting to open Adobe document from Smartform converted to pdf using CONVERT_OTF and GUI_DOWNLOAD I get error.  The abap completed each step with no errors and oddly the final pdf file created to PC was either 10 or 15 Mb even.  The 15Mb version when downloaded to network is 17.867 Mb downloaded in background so it is obvious something is wrong.
It should be
Note 1107236 regarding size is not applicable as we are at SAP BASIS SP19 and this is not applicable.
Step 1.      
        CALL FUNCTION 'CONVERT_OTF'
          EXPORTING
            FORMAT                = 'PDF'
          IMPORTING
            BIN_FILESIZE          = PDF_SIZE
            BIN_FILE              = PDF_DATA
          TABLES
            OTF                   = LT_OTFDATA[]
            LINES                 = L_DUMMY
          EXCEPTIONS
            ERR_MAX_LINEWIDTH     = 1
            ERR_FORMAT            = 2
            ERR_CONV_NOT_POSSIBLE = 3
            OTHERS                = 4.
Step2. 
Binary download table
        LV_VAR = PDF_SIZE DIV 1024.
        LV_VAR = LV_VAR + 1.
        DO LV_VAR TIMES.
          LV_VAR_FIRST = LV_VAR_FIRST + 1024.
          IF LV_VAR_FIRST LE PDF_SIZE.
            LV_VAR_FIRST = LV_VAR_FIRST - 1024.
            MOVE PDF_DATA+LV_VAR_FIRST(1024) TO LINE_BIN-DATA.
          ELSE.
            LV_VAR_FIRST = LV_VAR_FIRST - 1024.
            LV_VAR_LAST  = PDF_SIZE - LV_VAR_FIRST.
            MOVE PDF_DATA+LV_VAR_FIRST(LV_VAR_LAST) TO LINE_BIN-DATA.
          ENDIF.
          LV_VAR_FIRST = LV_VAR_FIRST + 1024.
          APPEND LINE_BIN TO DATA_TAB_BIN.
        ENDDO.
Step 3.
             CALL FUNCTION 'GUI_DOWNLOAD'
          EXPORTING
            FILENAME                = FNAME
            FILETYPE                = 'BIN'       " BIN
            CODEPAGE                = ZCODEPAGE   " issue 12869 02/10/2009 - 4110 is RU
          IMPORTING
            FILELENGTH              = LENGTH
          TABLES
            DATA_TAB                = DATA_TAB_BIN
          EXCEPTIONS
            FILE_WRITE_ERROR        = 1
            NO_BATCH                = 2
            GUI_REFUSE_FILETRANSFER = 3
            INVALID_TYPE            = 4
            NO_AUTHORITY            = 5
            UNKNOWN_ERROR           = 6
            HEADER_NOT_ALLOWED      = 7
            SEPARATOR_NOT_ALLOWED   = 8
            FILESIZE_NOT_ALLOWED    = 9
            HEADER_TOO_LONG         = 10
            DP_ERROR_CREATE         = 11
            DP_ERROR_SEND           = 12
            DP_ERROR_WRITE          = 13
            UNKNOWN_DP_ERROR        = 14
            ACCESS_DENIED           = 15
            DP_OUT_OF_MEMORY        = 16
            DISK_FULL               = 17
            DP_TIMEOUT              = 18
            FILE_NOT_FOUND          = 19
            DATAPROVIDER_EXCEPTION  = 20
            CONTROL_FLUSH_ERROR     = 21
            OTHERS                  = 22.

Answer 1

bin_filesize            = PDF_SIZE must be added as parm to function GUI_DOWNLOAD.