SAP_ABAP_Internal table data may be lost_INTO CORRESPONDING FIELDS OF TABLE / INTO @DATA(LT1)

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There is a possibility of losing data when using "INTO CORRESPONDING FIELDS OF TABLE / INTO @DATA(LT1)".

In other words: when there are multiple pieces of the same data in LT1, they will be overwritten by the last piece of data.

Problem case:

SELECT

        mseg~matnr,
        mseg~werks,
        mseg~ablad,
        mseg~mat_pspnr,
        mseg~menge,
        mseg~aufnr,
        mseg~dmbtr

      INTO CORRESPONDING FIELDS OF TABLE @lt1 FROM mseg FOR ALL ENTRIES IN @gt_alv
      WHERE mseg~ablad = @gt_alv-pspnr_char25
      AND mseg~aufnr <> ''
      and mseg~ablad <> ''

Solution: Add the primary key of the entry data

    SELECT
*{   INSERT         PS4K900292                                        9
*
      mseg~MBLNR,
      mseg~ZEILE,
*}   INSERT
        mseg~matnr,
        mseg~werks,
        mseg~ablad,
        mseg~mat_pspnr,
        mseg~menge,
        mseg~aufnr,
        mseg~dmbtr

      INTO CORRESPONDING FIELDS OF TABLE @lt1 FROM mseg FOR ALL ENTRIES IN @gt_alv
      WHERE mseg~ablad = @gt_alv-pspnr_char25
      AND mseg~aufnr <> ''
      and mseg~ablad <> ''
      .

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