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Eliminar todos los nodos de un TREE y poner nuevos
sub_node = node.
while sub_node is not initial.
call method tree1->get_next_sibling
exporting
i_node_key = sub_node
importing
e_next_node_key = sub_node.
if sub_node is not initial.
call method tree1->delete_subtree
exporting
i_node_key = sub_node.
endif.
endwhile.
if node is not initial.
call method tree1->delete_subtree
exporting
i_node_key = node.
endif.
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