SELECT statement causing error

Question

Hi all, a particular errors keeps on popping up when i try to activate my program. Error message is as follows:
The field "C~NAME1" from the SELECT list is missing in the GROUP BY clause. addition INTO wa or into (g1,...,gn) is required. fields of type "" or "A~MANDT".
Any ideas on what this syntax error message means?
Look at the SELECT statement that is causing the error:
  SELECT A~MATNR A~WERKS MAX( A~EBELN ) MAX( A~EBELP ) A~BUKRS A~MENGE A~NETPR A~PEINH B~LIFNR B~BEDAT C~NAME1
    INTO (WTAB-MATNR, WTAB-WERKS, WTAB-EBELN, WTAB-EBELP, WTAB-BUKRS, WTAB-MENGE, WTAB-NETPR, WTAB-PEINH, WTAB-LIFNR,WTAB-BEDAT, WTAB-NAME1)
    FROM EKPO AS A
      INNER JOIN EKKO AS B
        ON A~EBELN = B~EBELN AND
           A~BUKRS = B~BUKRS
      INNER JOIN LFA1 AS C
        ON B~LIFNR = C~LIFNR
*    FOR ALL ENTRIES IN ITAB
    WHERE A~WERKS = I_WERKS AND
          A~BUKRS = I_BUKRS AND
          B~BSTYP = 'F' AND
          B~SPRAS = 'EN'.

Answer 1

I've got another thing to ask. Ask you all know, i am suppose to complete (or ammend) the program that i am doing now. Look at parts of the original coding that i have yet to make changes to, i would like to know what is it suppose to do and output. Perhaps you guys could explain it better than my consultant:
TYPES: BEGIN OF TYP_MATTXT,
         MATNR LIKE MARA-MATNR,  "Material Number
         CTRT TYPE I,
         MAT_TXT(80) TYPE C,
         PO_TXT(80) TYPE C,
       END OF TYP_MATTXT.
DATA: MATTXT TYPE TYP_MATTXT OCCURS 0 WITH HEADER LINE.
DATA: WA_STXH TYPE STXH,
      TXT LIKE TLINE OCCURS 0 WITH HEADER LINE,
      TXT_KEY LIKE STXH-TDNAME.  "Name
*&    FORM SELECT_DATA                                                 *
FORM SELECT_DATA.
  SELECT A~MATNR A~MATKL B~MAKTX A~MTART A~EXTWG C~WERKS
    INTO CORRESPONDING FIELDS OF TABLE ITAB
    FROM MARA AS A
      INNER JOIN MAKT AS B
        ON A~MATNR = B~MATNR AND
           B~SPRAS = 'EN'
      INNER JOIN MARD AS C
        ON A~MATNR = C~MATNR
    WHERE A~MATNR IN I_MATNR AND
          A~MATKL IN I_MATKL AND
          A~MTART IN I_MTART AND
          A~EXTWG IN I_EXTWG AND
          C~WERKS = I_WERKS.
  SORT ITAB BY MATNR MATKL MTART EXTWG WERKS MAKTX.
  CHECK NOT ITAB[] IS INITIAL.
  SELECT A~MATNR A~MATKL A~WERKS MAX( A~EBELN ) MAX( A~EBELP ) A~BUKRS
A~MENGE A~NETPR A~PEINH A~MTART B~LIFNR B~BEDAT C~NAME1
  INTO TABLE WTAB
*    INTO (WTAB-MATNR, WTAB-WERKS, WTAB-EBELN, WTAB-EBELP, WTAB-BUKRS,
*WTAB-MENGE, WTAB-NETPR, WTAB-PEINH, WTAB-LIFNR,WTAB-BEDAT, WTAB-NAME1)
    FROM EKPO AS A
      INNER JOIN EKKO AS B
        ON A~EBELN = B~EBELN AND
           A~BUKRS = B~BUKRS AND
           B~BSTYP = 'F'
      INNER JOIN LFA1 AS C
        ON B~LIFNR = C~LIFNR
    WHERE A~MATNR IN I_MATNR AND
          A~MATKL IN I_MATKL AND
          A~WERKS = I_WERKS AND
          A~BUKRS = I_BUKRS AND
          A~MTART IN I_MTART AND
          A~LOEKZ = ' '
    GROUP BY A~MATNR A~MATKL A~WERKS A~EBELN A~EBELP A~BUKRS A~MENGE
A~NETPR A~PEINH A~MTART B~LIFNR B~BEDAT C~NAME1.
  SORT WTAB BY MATNR MATKL MTART WERKS EBELN EBELP MENGE NETPR PEINH
LIFNR BEDAT NAME1.
  LOOP AT WTAB.
    MOVE: WTAB-EBELN TO ITAB-EBELN,
          WTAB-EBELP TO ITAB-EBELP,
          WTAB-BUKRS TO ITAB-BUKRS,
          WTAB-MENGE TO ITAB-MENGE,
          WTAB-NETPR TO ITAB-NETPR,
          WTAB-PEINH TO ITAB-PEINH,
*          WTAB-MTART TO ITAB-MTART,
          WTAB-LIFNR TO ITAB-LIFNR,
          WTAB-BEDAT TO ITAB-BEDAT,
          WTAB-NAME1 TO ITAB-NAME1.
   MOVE ITAB-MATNR TO TXT_KEY.
   PERFORM READ_TXT USING 'BEST' TXT_KEY 'MATERIAL'.
   CONCATENATE ITAB-EBELN ITAB-EBELP INTO TXT_KEY.
   PERFORM READ_TXT USING 'F01' TXT_KEY 'EKPO'.
    MODIFY ITAB TRANSPORTING EBELN EBELP BUKRS MENGE NETPR PEINH LIFNR
BEDAT NAME1
      WHERE MATNR = WTAB-MATNR.
  ENDLOOP.
  SORT ITAB BY MATNR MATKL MTART.
  DELETE ADJACENT DUPLICATES FROM ITAB COMPARING ALL FIELDS.
  LINE_CHECK = 0.
ENDFORM.
*&    FORM READ_TXT                                                    *
FORM READ_TXT USING ID XNAME OBJ.
DATA: CTR TYPE I,
      PO_CTR TYPE I.
CLEAR: TXT.
  SELECT SINGLE * FROM STXH CLIENT SPECIFIED
  INTO WA_STXH
  WHERE MANDT = SY-MANDT AND
        TDOBJECT = OBJ AND
        TDNAME = XNAME AND
        TDID = ID AND
        TDSPRAS  = SY-LANGU.
  IF SY-SUBRC = 0.
    REFRESH TXT.
    CTR = 1.
    CALL FUNCTION 'READ_TEXT'
         EXPORTING
              CLIENT   = SY-MANDT
              ID       = ID
              NAME     = XNAME
              OBJECT   = OBJ
              LANGUAGE = SY-LANGU
         TABLES
              LINES    = TXT.
    LOOP AT TXT.
      IF ID = 'BEST'.
        MOVE XNAME TO MATTXT-MATNR.
        MOVE CTR TO MATTXT-CTRT.
        MOVE TXT-TDLINE TO MATTXT-MAT_TXT.
        APPEND MATTXT.
      ELSEIF ID = 'F01'.
        READ TABLE MATTXT WITH KEY MATNR = ITAB-MATNR CTRT = CTR.
        IF SY-SUBRC = 0.
          MOVE TXT-TDLINE TO MATTXT-PO_TXT.
          MODIFY MATTXT TRANSPORTING PO_TXT
          WHERE MATNR = ITAB-MATNR.
        ELSE.
          MOVE ITAB-MATNR TO MATTXT-MATNR.
          MOVE CTR TO MATTXT-CTRT.
          MOVE TXT-TDLINE TO MATTXT-PO_TXT.
          APPEND MATTXT.
        ENDIF.
      ENDIF.
      CTR = CTR + 1.
    ENDLOOP.
  ENDIF.
ENDFORM.