How to add sum in dynamic alv ?

hello ,
i create dynamic alv , by using FIELD-SYMBOLS ,
but my columns are char type , and the SUM an SUBTOTAL
not work .
how i can tern the internal table that build with char
columns to be numeric (like BSIK-WRBTR)?

FIRST OF ALL THANKS , BUT .... ))
NOW THE LINE OF THE SUM DISPLAY AS THE FIRST LINE AND
ALL OTHER LINE AFTER IT )) .
HOW CAN I TERN IT TO BE NORMAL ( IN BUTTOM ) ? .
CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'
    EXPORTING
      I_STRUCTURE_NAME = 'YAG_ST_FOR_SPLITE_PER_VEND'
    CHANGING
      CT_FIELDCAT      = LT_FIELDCATALOG[].
DESCRIBE TABLE LT_FIELDCATALOG LINES LIN6 .
LIN6 = LIN6 + 1 .
LOOP AT IT_SPLITE_COLUMNE .
    LS_ALV_CAT-FIELDNAME = IT_SPLITE_COLUMNE-FIELD_NAME.
    LS_ALV_CAT-REF_FIELD = IT_SPLITE_COLUMNE-FIELD_NAME.
    LS_ALV_CAT-COL_POS   = LIN6.
    LS_ALV_CAT-DATATYPE   = 'QUAN'.
    LS_ALV_CAT-DO_SUM     = 'X'.
    LS_ALV_CAT-TABNAME   = 'IT_SPLIT_FOR_REP'.
    APPEND LS_ALV_CAT TO LT_FIELDCATALOG.
    LIN6 = LIN6 + 1 .
ENDLOOP.

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