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Checa este codigo :)
ls_fieldcat-fieldname = 'BELNR'.
ls_fieldcat-ref_fieldname = 'BELNR'.
ls_fieldcat-ref_tabname = 'tbkpf'.
ls_fieldcat-reptext_ddic = 'Num. Docto'.
ls_fieldcat-col_pos = 2.
ls_fieldcat-do_sum = 'X'
ls_fieldcat-no_out = ' ' .
ls_fieldcat-sp_group = '1'.
APPEND ls_fieldcat TO e01_lt_fieldcat.
El secreto esta en usar el campo DO_SUM
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