@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((cost == null) ? 0 : cost.hashCode());
		result = prime * result + ((id == null) ? 0 : id.hashCode());
		result = prime * result
				+ ((partNumber == null) ? 0 : partNumber.hashCode());
		result = prime * result
				+ ((productId == null) ? 0 : productId.hashCode());
		result = prime * result
				+ ((productName == null) ? 0 : productName.hashCode());
		result = prime * result
				+ ((quantity == null) ? 0 : quantity.hashCode());
		result = prime * result
				+ ((salePrice == null) ? 0 : salePrice.hashCode());
		result = prime * result + ((vatRate == null) ? 0 : vatRate.hashCode());
		return result;
	}