How to change the effect of drag and drop from MOVE to COPY in alv tree.

Hi,
I am using a tool in which now the behaviour on drag and drop is MOVE. I want to change it to COPY.
But I do not know which parameter needs to be set and where.
please help.
Regards,
Smita.

Hi,
Thanks for quick reply.
The code goes on like this
METHOD set_dd_behavior.
DATA: l_copysrc(1) TYPE c,
        l_movesrc(1) TYPE c,
        l_droptarget(1) TYPE c.
Set the Drag and Drop Flavors.
CREATE OBJECT dd_behavior.
READ TABLE reg_functions WITH KEY name_function = 'COPY'
TRANSPORTING NO FIELDS.
IF sy-subrc = 0.
    l_copysrc = 'X' .
ENDIF.
READ TABLE reg_functions WITH KEY name_function = 'CUT'
TRANSPORTING NO FIELDS.
IF sy-subrc = 0.
    l_movesrc = 'X' .
ENDIF.
READ TABLE reg_functions WITH KEY name_function = 'PASTE'
TRANSPORTING NO FIELDS.
IF sy-subrc = 0.
    l_droptarget = 'X' .
ENDIF.
CALL METHOD dd_behavior->add
EXPORTING
flavor = 'MOVE'
dragsrc = l_movesrc
droptarget = l_droptarget
effect = cl_dragdrop=>move.
CALL METHOD dd_behavior->add
EXPORTING
flavor = 'COPY'
dragsrc = l_copysrc
droptarget = l_droptarget
effect = cl_dragdrop=>copy.
CALL METHOD dd_behavior->get_handle
IMPORTING handle = dd_behavior_handle.
ENDMETHOD.
Here what changes needs to be done.
As I see once COPY is added and next time MOVE is added.
I am able to check because I am not able to edit while debugging the value of effect.
Please suggest.
Warm regards,
Smita.

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