REUSE_ALV_FIELDCATALOG_MERGE missing fields

Hi experts, I'm using FM REUSE_ALV_FIELDCATALOG_MERGE in 4.6 C. It works fine, but in 6.0 two fields are missing when displaying the ALV list. The two fields existing in the data dictionary, so I can't understand why is it.

FORM f_prepare_fcat CHANGING p_gt_fieldcat TYPE slis_t_fieldcat_alv.

....

CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'

EXPORTING

i_program_name = v_repid

i_internal_tabname = 'I_LIST'

• I_STRUCTURE_NAME =

• I_CLIENT_NEVER_DISPLAY = 'X'

i_inclname = v_repid

• I_BYPASSING_BUFFER =

• I_BUFFER_ACTIVE =

CHANGING

ct_fieldcat = p_gt_fieldcat

EXCEPTIONS

inconsistent_interface = 1

program_error = 2

OTHERS = 3

.....

.