Changing the text and the order of columns in ALV for WebDynpro

Hello experts, im using ALV in WebDynpro, and i have this code:
lr_column   = lo_value->if_salv_wd_column_settings~get_column( 'ZNC_MONTO_LIQ' ).
lr_column_header = lr_column->get_header( )
lr_column_header->set_text( 'IMPORTE' ).
but this code, doesn't change the title of the column.
the same happens when i put the visibility in "none" or when i change the position of the column
Anyone can tell why this is happening?
Thanks!

You can't set the text of the generated header directly.  You have to first delete the standard header and create a new one.  You can then override the header text.
l_column = l_table->if_salv_wd_column_settings~get_column( 'CREATED_AT' ).
  l_column->delete_header( ).
  l_header = l_column->create_header( ).
  l_header->set_text( `Created At` ).

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