Why values are not displayed for some columns of an ALV List? - abap

Question

I am trying to create an ALV report with list display but some of the contents are not displaying in the output list. I created a classical report and an ALV report with grid display and I was successful. But this list display is creating a problem.
I've included the REUSE_ALV_LIST_DISPLAY function, with the right internal table name. I've debugged and all my data is coming in the final internal table correctly but it is not displaying in output list:
Here is my code (note that the flight demo data is to be generated via the program SAPBC_DATA_GENERATOR, once):
REPORT ztest.
SELECT scarr~carrid, spfli~connid
FROM scarr INNER JOIN spfli ON scarr~carrid = spfli~carrid
INTO TABLE #DATA(it_f).
DATA(it_fcat) = VALUE slis_t_fieldcat_alv(
( tabname = 'SCARR'
fieldname = 'CARRID'
seltext_l = 'Carrier code'
col_pos = 1
outputlen = 20 )
( tabname = 'SPFLI'
fieldname = 'CONNID'
seltext_l = 'Connection ID'
col_pos = 2
outputlen = 20 ) ).
CALL FUNCTION 'REUSE_ALV_LIST_DISPLAY'
EXPORTING
it_fieldcat = it_fcat
TABLES
t_outtab = it_f.

Answer 1

In a simple ALV table, you don't have to fill the component TABNAME of the field catalog. TABNAME is only needed for the hierarchical-sequential lists (function module REUSE_ALV_HIERSEQ_LIST_DISPLAY for instance) which are an output of two tables.
If you omit it, or if you give the same value (any value) for all columns, you will get a correct output:
Code with the correction:
SELECT scarr~carrid, spfli~connid
FROM scarr INNER JOIN spfli ON scarr~carrid = spfli~carrid
INTO TABLE #DATA(it_f).
DATA(it_fcat) = VALUE slis_t_fieldcat_alv(
( " do not fill TABNAME // tabname = 'SCARR'
fieldname = 'CARRID'
seltext_l = 'Carrier code'
col_pos = 1
outputlen = 20 )
( " do not fill TABNAME // tabname = 'SPFLI'
fieldname = 'CONNID'
seltext_l = 'Connection ID'
col_pos = 2
outputlen = 20 ) ).
CALL FUNCTION 'REUSE_ALV_LIST_DISPLAY'
EXPORTING
it_fieldcat = it_fcat
TABLES
t_outtab = it_f.

Answer 2

EDIT: I see that you two already solved the problem in comments.
As Sandra wrote, you could try using cl_salv_table. It should look like this:
cl_salv_table=>factory(
* EXPORTING
* list_display = if_salv_c_bool_sap=>true
* r_container =
* container_name =
IMPORTING
r_salv_table = DATA(lr_alv)
CHANGING
t_table = it_f
).
lr_alv->display( ).