Transfer an internal table with non char data type to an application server

Question

Here is a part of my code. lv_string variable was type string initially but i got an error Not mutually convertible in a Unicode Program. I changed it to type ty_afko. Now the program works but the data it puts out has just a bunch of  #####. I cannot make all value in the internal table type char because then my select statement is giving errors..  Please help...
Type: BEGIN OF ty_afko,
       rsnum LIKE afko-rsnum,          " Number of reservation
       aprio LIKE afko-aprio,          " Order Priority
       maufnr LIKE afko-maufnr,          " Number of superior order
       lead_aufnr LIKE afko-lead_aufnr,     " Leading order in current processing
     END OF ty_afko.
data: gt_afko         TYPE STANDARD TABLE OF ty_afko INITIAL SIZE 0,
      wa_afko         TYPE ty_afko,
select  rsnum aprio maufnr lead_aufnr
from afko into table gt_afko.
IF gv_error = 'X'.
  EXIT.
ELSE.
<b>DATA: Lv_string type ty_afko.</b>
  loop at gt_afko into wa_afko.
    clear lv_string.
<b>  move wa_afko to lv_string.</b>
    perform f_transfer_dataset using gc_f_afko lv_string changing gv_error.
  endloop.
endif.
FORM f_transfer_dataset USING         p_file
                                      p_data
                        CHANGING      p_error TYPE c.
  Data: lv_file(25) type c.
  CONCATENATE gc_path p_file INTO lv_file.
  TRANSFER p_data TO lv_file.
ENDFORM.                    "F_TRANSFER_DATASET

Answer 1

The key is to create another empty structure with fields of type c.
TYPES:       BEGIN OF ty_resb,
            bdter TYPE RESB-BDTER,     " This field is type d
            bdmng type resb-bdmng,  " This field is type p with 3 decimals - total 14
          END OF ty_resb,
          BEGIN OF ty_resbstr,     " This structure is the same as above but the field types will be char.
           bdter(10),            
           bdmng(14),                
          END OF ty_resbstr.
DATA:     gt_resb         TYPE STANDARD TABLE OF ty_resb,
          wa_resb         TYPE ty_resb,
       structure type  ty_resbstr. " Empty fields with the same structure as the work area.
SELECT   bdter bdmng  FROM resb INTO corresponding fields of TABLE gt_resb.
      open dataset pfile for output in text mode encoding default.
      loop at gt_resb into wa_resb.
          clear gv_string.
        move-corresponding wa_resb to gv_string.
         perform f_transfer_dataset using gc_f_resb gv_string.     
        endloop.
     FORM f_transfer_dataset USING p_file p_data.         
       TRANSFER p_data TO lv_file.     
     ENDFORM.