Error in Field symbol assignment

Question

What is wrong in following code ???
At line --> (Bold) I am gettin sy-subrc 4.
field-symbols: <F> type any,
                     <FSVALUE> type any.
    SPLIT P_QUOTATION_TEXT-TEXT_LINE AT CRLF INTO TABLE I_SPLIT.
    IF NOT I_SPLIT[] IS INITIAL.
      LOOP AT I_SPLIT ASSIGNING <F>.
-->      ASSIGN COMPONENT SY-TABIX OF STRUCTURE <F> TO <FSVALUE>.
        IF SY-SUBRC = 0.
          WA_TEXT-ITM_NUMBER = P_QUOTATION_TEXT-ITM_NUMBER.
          WA_TEXT-TEXT_ID = C_HEADERTEXT.
          WA_TEXT-LANGU  =  'EN'.
          WA_TEXT-FORMAT_COL = '*'.
          WA_TEXT-TEXT_LINE = <FSVALUE>.
          APPEND WA_TEXT TO I_TEXT.
          CLEAR WA_TEXT.
        ENDIF.
      ENDLOOP.

Answer 1

I'll try to get clearer
SPLIT P_QUOTATION_TEXT-TEXT_LINE AT CRLF INTO TABLE I_SPLIT.
You are splitting at CRLF, fine. I_split has only one field or none if you want to get more thecnical.
LOOP AT I_SPLIT ASSIGNING <F>.
Here you are starting to loop at each entry of i_split, assigning each entry to , again only one field
ASSIGN COMPONENT SY-TABIX OF STRUCTURE <F> TO <FSVALUE>.
Again, this will never work because as you are declaring it i_split doesn't have an structure, also  doesn´t have an structure only one field
It doesn't make any sense that you are assigning the same field to another field-symbol when you already have one.
And even if you used the type I told you, it would only work in the first pass because only in the first pass you can assign the component 1 of the structure because the structure only has one field, there would not be any component 2,3... etc.
Again I don't understand what you are trying to do, if you want to assign that loop pass text to a table, just pass the field-symbol you already have