grzanieplus.pl/plugins/stDiscountPlugin/modules/stDiscountBackend/templates/_wholesale_value.php

<?php
if (null !== $entity->getWholesaleValue())
{
    echo $entity->getPriceType() == Discount::PERCENT_TYPE ? $entity->getWholesaleValue().'%' : st_currency_default_format($entity->getWholesaleValue());
}