Stock/Assigner/StockUnitAssigner.php
protected function removeAssignment(StockAssignmentInterface $assignment)
    {
        $this->unitUpdater->updateSold($assignment->getStockUnit(), -$assignment->getSoldQuantity(), true);

        $assignment
            ->setSaleItem(null)
            ->setStockUnit(null);

        $this->persistenceHelper->remove($assignment);
    }
protected function removeAssignment(StockAssignmentInterface $assignment)
    {
        $this->unitUpdater->updateSold($assignment->getStockUnit(), -$assignment->getSoldQuantity(), true);

        $assignment
            ->setSaleItem(null)
            ->setStockUnit(null);

        $this->persistenceHelper->remove($assignment);
    }
Removes a single assignment.

@param StockAssignmentInterface $assignment