动态下拉列表

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1.element 设置为 dropdown_by_key 类型：

2.初始化代码：

  DATA: lt_filt_vals TYPE wdr_context_attr_value_list, "filtered values
        ls_filt_vals TYPE wdr_context_attr_value.

  ls_filt_vals-value = 'XL'.
  ls_filt_vals-text = wd_assist->if_wd_component_assistance~get_text( '001' ).
  APPEND ls_filt_vals TO lt_filt_vals.
  CLEAR ls_filt_vals.
  ls_filt_vals-value = 'XH'.
  ls_filt_vals-text = wd_assist->if_wd_component_assistance~get_text( '002' ).
  APPEND ls_filt_vals TO lt_filt_vals.
  CLEAR ls_filt_vals.
  ls_filt_vals-value = 'DM'.
  ls_filt_vals-text = wd_assist->if_wd_component_assistance~get_text( '004' ).
  APPEND ls_filt_vals TO lt_filt_vals.

  DATA wd_context_info TYPE REF TO if_wd_context_node_info.
  wd_context_info = wd_context->get_node_info( ).
  wd_context_info->set_attribute_value_set( EXPORTING name = 'BCTYP' value_set = lt_filt_vals ).

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