Alv OO program error Message no. 0K534 - abap

Question

Everytime i hit enter or any command button the program prompt an error message.
base on this thread http://scn.sap.com/thread/65856 i should declare my internal table
globally on top include.
Even though i already added all variable globally still the error is the same.
Top Include.
data: gr_data type ref to data.
data: la_data type ref to data.
field-symbols: <gt_data> type standard table.
Classs Declaration
me->get_data( CHANGING c_data = <f_tab> ). " Fetch Dynamic Data
METHOD get_data.
GET REFERENCE OF c_data INTO la_data.
move la_data TO gr_data.
assign gr_data->* to <gt_data>.
me->display( ).
assign gr_data->* to <gt_data>.
IF gc_custom_container is initial.
CREATE OBJECT gc_custom_container
EXPORTING
container_name = gv_mycontainer.
ENDIF.
if table is not bound.
try.
"// Create ALV Instance
cl_salv_table=>factory(
exporting
r_container = gc_custom_container
container_name = 'TC_MIXING'
importing
r_salv_table = table
changing
t_table = <gt_data>
).
catch cx_salv_msg. "#EC NO_HANDLER
endtry.
"// Setup ALV Attributes
functions = table->get_functions( ).
functions->set_all( abap_true ).
columns = table->get_columns( ).
columns->set_optimize( abap_true ).
try.
column = columns->get_column( 'MANDT' ).
column->set_technical( if_salv_c_bool_sap=>true ).
catch cx_salv_not_found.
endtry.
"// Dispalay ALV Model
table->display( ).
else.
table->refresh( ).
endif.
ENDMETHOD.
and another question:
how to create structure dynamically base on field-symbol. is this possible?
ls_testvar like line of <f_tab>.
thanks and regards,
Mapet

Answer 1

Question two is possible, with some usage of runtime type services.
Take a look at runtime type services.
se24
CL_ABAP_CLASSDESCR Run Time Type Services
CL_ABAP_DATADESCR Run Time Type Services
CL_ABAP_ELEMDESCR Run Time Type Services
CL_ABAP_INTFDESCR Run Time Type Services
CL_ABAP_OBJECTDESCR Run Time Type Services
CL_ABAP_REFDESCR Run Time Type Services
CL_ABAP_STRUCTDESCR Run Time Type Services
CL_ABAP_TABLEDESCR Run Time Type Services
CL_ABAP_TYPEDESCR Run Time Type Services
You can get the type of the fieldsymbol and create a structure based on it, perhaps You have to iterate through fieldsymbol, if it is composed type and add each component.

Answer 2

I agree, you should not pass a field symbol to the changing parameter for the table data! Use a global or static table. You should also use a typed table instead of data and create your field catalog in design time. This improves the performance a lot.
Cheers

Answer 3

Your table variable holding the ALV must be declared globally as well.
cl_salv_table=>factory(
exporting
r_container = gc_custom_container
container_name = 'TC_MIXING'
importing
r_salv_table = table
changing
t_table = <gt_data>
).
You should separate data retrieving from your displaying code like this:
START-OF-SELECTION.
gr_class->get_data( ).
CALL SCREEN 2000.
PBO:
gr_class->display.
Your display method:
METHOD display IMPLEMENTATION.
IF me->gr_container IS NOT BOUND.
gr_table->display( ).
ELSE.
gr_table->refresh( ).
ENDIF.