Create a Z extractor writing a code in SE37 calling FM READ_TEXT

Hello,
Could you please help me in the following case?
I need to extract the material sales text.
I have created a structure in SE 11 using the fields VKORG, MATNR, VTWEG, ZSTXT.
Then I am in SE37 building a Z function module, but I do not know how to write in the source code something that calls READ_TEXT properly. What I have for the moment is writen below. Also in the tabs of FM in SE37: Import, Export, Changing, Tables and Exception I am not sure what to fill.
Could you please help?
Thanks & Regards,
Adriana Oliveira
FORM first_call TABLES   P_I_T_SELECT STRUCTURE ZZSALES_TEXT
                         P_I_T_FIELDS STRUCTURE I_T_FIELDS
                USING    P_I_REQUNR
                         P_I_INITFLAG
                         P_I_DSOURCE
                         P_I_MAXSIZE
                CHANGING P_S_S_IF.
DATA : git_memo1 TYPE STANDARD TABLE OF tline,
       g_name1   LIKE thead-tdname,
       gwa_memo1    TYPE tline.
loop at s_matnr.
          CONCATENATE s_matnr-low g_vkorg c_00 INTO g_name1.
        CALL FUNCTION 'READ_TEXT'
           EXPORTING
                id                      = '0001'
                language                = PT
                name                    = g_name1
                object                  = 'MVKE'
           TABLES
                lines                   = git_memo1
           EXCEPTIONS
                id                      = 1
                language                = 2
                name                    = 3
                not_found               = 4
                object                  = 5
                reference_check         = 6
                wrong_access_to_archive = 7
                OTHERS                  = 8.
               loop at git_memo1 into gwa_memo1.
                write :/0(20) s_matnr-low,25(60) gwa_memo1-TDLINE.
               endloop.
endloop.

I would like to answer your question in 2 steps
1) How to create a generic extractor using FM
This weblog will explain you everything
Generic Extraction via Function Module
I feel u should start from scratch builing your FM as u need to make a copy of the standard FM make a copy of the standard fm 'RSAX_BIW_GET_DATA_SIMPLE'.
This will solve your questions regarding Import, Export, Changing, Tables and Exception
2) How to use READ_TEXT fm
I'll give u an extract of the code u need.Basically u need to use init_text before u use read_text.
 CONCATENATE <f_mvke>-matnr <f_mvke>-vkorg <f_mvke>-vtweg INTO w_name RESPECTING BLANKS.
*Get Sales Text
 CALL FUNCTION 'INIT_TEXT'
 EXPORTING
 ID = '0001'
 LANGUAGE = sy-langu
 NAME = w_name
 OBJECT = 'MVKE'
 TABLES
 LINES = it_lines
 EXCEPTIONS
 ID = 1
 LANGUAGE = 2
 NAME = 3
 OBJECT = 4
 OTHERS = 5.
 IF SY-SUBRC = 0.
 REFRESH it_lines.
 CALL FUNCTION 'READ_TEXT'
 EXPORTING
 CLIENT = sy-mandt
 ID = '0001'
 LANGUAGE = sy-langu
 NAME = w_name
 OBJECT = 'MVKE'
 TABLES
 LINES = it_lines
 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.
Populate the required fields by reading from it_lines
*as it_lines is a table not just a variable
 ENDIF.
ENDIF.
Hope this helps you to proceed.

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