QTD_RETIRE
if ((!last_qtd) && (qtd->status == QTD_RETIRE))
qtd_next->status = QTD_RETIRE;
qtd_next->status = QTD_RETIRE;
if ((qtd->status == QTD_RETIRE) &&
qtd->status = QTD_RETIRE;
qtd->status = QTD_RETIRE;