How to show the same result as I input (PO Material Text)

Question

I have a question that
I need to show PO Material Text in the form.
i use this function as usual....
CALL FUNCTION 'READ_TEXT'
    EXPORTING
      ID                      = 'BEST'
      LANGUAGE                = 'E'
      NAME                    = T_NAME
      OBJECT                  = 'MATERIAL'
    TABLES
      LINES                   = T_TLINE
    EXCEPTIONS
      ID                      = 1
      LANGUAGE                = 2
      NAME                    = 3
      NOT_FOUND               = 4
      OBJECT                  = 5
      REFERENCE_CHECK         = 6
      WRONG_ACCESS_TO_ARCHIVE = 7
      OTHERS                  = 8.
  IF SY-SUBRC = 0.
    LOOP AT T_TLINE.
      MOVE T_TLINE-TDLINE TO THE_DOC.
      CONCATENATE THE_DOC1 THE_DOC INTO THE_DOC1.
    ENDLOOP.
  ENDIF.
  MY_MTEXT = THE_DOC1.
the result maybe concatenate all lines into 1 line
but now, i'd like to show the same line as I input now,
for example:
i input the PO Material Text : 
123
456
789
if i use that function, it should become :
123 456 789
but i'd like the result is the same as i input like this.
123
456
789
so, should I need to use "INCLUDE......"   in ABAP Script Form?
Pls advise.
Thx                                           
how to do that?

Answer 1

Thx for your advice,
But I've already use perform...function ...to return the my_mtext. ( but it the single line that i concatenate all the line content..)
FORM GET_MATERIAL_PO_TEXT_FOR_MOULD USING MY_MATNR
                            MY_EBELP
                    CHANGING MY_MTEXT.
but my problem is that...the line of PO text varies....how can I know how many variables need to pass the value to program.
if the value contains 3 lines.. i want to pass this 3 lines and show in the form.
i'm confuse...how to do that ..?