New Post: Issue with importing Options

I'm attempting to import options using XML, generated by a program I've written to extract data from my Quote Software (QuoteWerks).
As far as I can see, the XML looks fine, but it's only importing the first option.
This is an edited sample for one product:

<P>
        <NB_Store_ProductsInfo>
          <ProductID>4</ProductID>
          <PortalID>0</PortalID>
          <TaxCategory>-1</TaxCategory>
          <Featured>false</Featured>
          <Archived>false</Archived>
          <CreatedByUser>1</CreatedByUser>
          <CreatedDate>2014-02-25T12:35:55.5359411+13:00</CreatedDate>
          <IsDeleted>false</IsDeleted>
          <ProductRef>DURA-S15C</ProductRef>
          <Lang>en-AU</Lang>
          <Summary />
          <Description>My Description</Description>
          <Manufacturer>Twinhead</Manufacturer>
          <ProductName>Twinhead Durabook S15C Notebook Computer</ProductName>
          <XMLData />
          <ModifiedDate>2014-02-25T12:35:55.5359411+13:00</ModifiedDate>
          <SEOName />
          <Tagwords />
          <IsHidden>false</IsHidden>
        </NB_Store_ProductsInfo>
        <M>
          <NB_Store_ModelInfo>
            <ModelID>28</ModelID>
            <ProductID>4</ProductID>
            <ListOrder>1</ListOrder>
            <UnitCost>1763.01</UnitCost>
            <Barcode />
            <ModelRef>DURA-S15C-N1</ModelRef>
            <Lang>en-AU</Lang>
            <ModelName>i3-350/4GB/500GB/W7HP</ModelName>
            <QtyRemaining>-1</QtyRemaining>
            <QtyTrans>0</QtyTrans>
            <QtyTransDate>2014-02-25T12:35:55.5359411+13:00</QtyTransDate>
            <ProductName>Twinhead Durabook S15C Notebook Computer</ProductName>
            <PortalID>0</PortalID>
            <Weight>1</Weight>
            <Height>0</Height>
            <Length>0</Length>
            <Width>0</Width>
            <Deleted>false</Deleted>
            <QtyStockSet>0</QtyStockSet>
            <DealerCost>1763.01</DealerCost>
            <PurchaseCost>0</PurchaseCost>
            <XMLData />
            <Extra />
            <DealerOnly>false</DealerOnly>
          </NB_Store_ModelInfo>
        </M>
        <D />
        <C>
          <NB_Store_ProductCategoryInfo>
            <ProductID>4</ProductID>
            <CategoryID>48</CategoryID>
          </NB_Store_ProductCategoryInfo>
        </C>
        <R>
          <NB_Store_ProductRelatedInfo>
            <RelatedID>3</RelatedID>
            <PortalID>0</PortalID>
            <ProductID>4</ProductID>
            <RelatedProductID>5</RelatedProductID>
            <DiscountAmt>0</DiscountAmt>
            <DiscountPercent>0</DiscountPercent>
            <ProductQty>0</ProductQty>
            <MaxQty>0</MaxQty>
            <RelatedType>1</RelatedType>
            <Disabled>false</Disabled>
            <NotAvailable>false</NotAvailable>
            <BiDirectional>true</BiDirectional>
            <RelatedProductRef>DURA-S15C-ACC</RelatedProductRef>
            <RelatedProductName>Twinhead Durabook S15C Accessories</RelatedProductName>
          </NB_Store_ProductRelatedInfo>
        </R>
        <options>
          <O>
            <NB_Store_OptionInfo>
              <OptionID>2</OptionID>
              <Lang>en-AU</Lang>
              <ProductID>4</ProductID>
              <ListOrder>2</ListOrder>
              <Lang>en-AU</Lang>
              <OptionDesc>CPU</OptionDesc>
              <Attributes />
            </NB_Store_OptionInfo>
            <OV>
              <NB_Store_OptionValueInfo>
                <OptionValueID>20</OptionValueID>
                <OptionID>2</OptionID>
                <AddedCost>0.0</AddedCost>
                <ListOrder>3</ListOrder>
                <Lang>en-AU</Lang>
                <OptionValueDesc>No CPU Upgrade</OptionValueDesc>
              </NB_Store_OptionValueInfo>
              <NB_Store_OptionValueInfo>
                <OptionValueID>21</OptionValueID>
                <OptionID>2</OptionID>
                <AddedCost>349.00</AddedCost>
                <ListOrder>4</ListOrder>
                <Lang>en-AU</Lang>
                <OptionValueDesc>Upgrade to i7-3520,2.9Ghz 4M cache CPU</OptionValueDesc>
              </NB_Store_OptionValueInfo>
            </OV>
            <O>
              <NB_Store_OptionInfo>
                <OptionID>3</OptionID>
                <Lang>en-AU</Lang>
                <ProductID>4</ProductID>
                <ListOrder>3</ListOrder>
                <Lang>en-AU</Lang>
                <OptionDesc>HDD</OptionDesc>
                <Attributes />
              </NB_Store_OptionInfo>
              <OV>
                <NB_Store_OptionValueInfo>
                  <OptionValueID>22</OptionValueID>
                  <OptionID>3</OptionID>
                  <AddedCost>0.0</AddedCost>
                  <ListOrder>5</ListOrder>
                  <Lang>en-AU</Lang>
                  <OptionValueDesc>No  Hard Drive Upgrade</OptionValueDesc>
                </NB_Store_OptionValueInfo>
                <NB_Store_OptionValueInfo>
                  <OptionValueID>23</OptionValueID>
                  <OptionID>3</OptionID>
                  <AddedCost>89.00</AddedCost>
                  <ListOrder>6</ListOrder>
                  <Lang>en-AU</Lang>
                  <OptionValueDesc>Upgrade from 500GB to 1TB HDD</OptionValueDesc>
                </NB_Store_OptionValueInfo>
                <NB_Store_OptionValueInfo>
                  <OptionValueID>24</OptionValueID>
                  <OptionID>3</OptionID>
                  <AddedCost>149.00</AddedCost>
                  <ListOrder>7</ListOrder>
                  <Lang>en-AU</Lang>
                  <OptionValueDesc>Upgrade from 500GB to 120GB SSD</OptionValueDesc>
                </NB_Store_OptionValueInfo>
                <NB_Store_OptionValueInfo>
                  <OptionValueID>25</OptionValueID>
                  <OptionID>3</OptionID>
                  <AddedCost>299.00</AddedCost>
                  <ListOrder>8</ListOrder>
                  <Lang>en-AU</Lang>
                  <OptionValueDesc>Upgrade from 500GB to 250GB SSD</OptionValueDesc>
                </NB_Store_OptionValueInfo>
              </OV>
            </O>
            <O>
              <NB_Store_OptionInfo>
                <OptionID>4</OptionID>
                <Lang>en-AU</Lang>
                <ProductID>4</ProductID>
                <ListOrder>4</ListOrder>
                <Lang>en-AU</Lang>
                <OptionDesc>Memory</OptionDesc>
                <Attributes />
              </NB_Store_OptionInfo>
              <OV>
                <NB_Store_OptionValueInfo>
                  <OptionValueID>26</OptionValueID>
                  <OptionID>4</OptionID>
                  <AddedCost>0.0</AddedCost>
                  <ListOrder>9</ListOrder>
                  <Lang>en-AU</Lang>
                  <OptionValueDesc>No Memory Upgrade</OptionValueDesc>
                </NB_Store_OptionValueInfo>
                <NB_Store_OptionValueInfo>
                  <OptionValueID>27</OptionValueID>
                  <OptionID>4</OptionID>
                  <AddedCost>88.0</AddedCost>
                  <ListOrder>10</ListOrder>
                  <Lang>en-AU</Lang>
                  <OptionValueDesc>Upgrade to 8GB RAM</OptionValueDesc>
                </NB_Store_OptionValueInfo>
              </OV>
            </O>
            <O>
              <NB_Store_OptionInfo>
                <OptionID>5</OptionID>
                <Lang>en-AU</Lang>
                <ProductID>4</ProductID>
                <ListOrder>5</ListOrder>
                <Lang>en-AU</Lang>
                <OptionDesc>OS</OptionDesc>
                <Attributes />
              </NB_Store_OptionInfo>
              <OV>
                <NB_Store_OptionValueInfo>
                  <OptionValueID>29</OptionValueID>
                  <OptionID>5</OptionID>
                  <AddedCost>0.0</AddedCost>
                  <ListOrder>11</ListOrder>
                  <Lang>en-AU</Lang>
                  <OptionValueDesc>Windows 7 Home Premium</OptionValueDesc>
                </NB_Store_OptionValueInfo>
                <NB_Store_OptionValueInfo>
                  <OptionValueID>30</OptionValueID>
                  <OptionID>5</OptionID>
                  <AddedCost>119.00</AddedCost>
                  <ListOrder>12</ListOrder>
                  <Lang>en-AU</Lang>
                  <OptionValueDesc>Upgrade to Windows 7 Professional</OptionValueDesc>
                </NB_Store_OptionValueInfo>
              </OV>
            </O>
            <O>
              <NB_Store_OptionInfo>
                <OptionID>6</OptionID>
                <Lang>en-AU</Lang>
                <ProductID>4</ProductID>
                <ListOrder>6</ListOrder>
                <Lang>en-AU</Lang>
                <OptionDesc>Warranty</OptionDesc>
                <Attributes />
              </NB_Store_OptionInfo>
              <OV>
                <NB_Store_OptionValueInfo>
                  <OptionValueID>31</OptionValueID>
                  <OptionID>6</OptionID>
                  <AddedCost>0.0</AddedCost>
                  <ListOrder>13</ListOrder>
                  <Lang>en-AU</Lang>
                  <OptionValueDesc>Standard 2 Year Parts and Labour Return to Base Warranty</OptionValueDesc>
                </NB_Store_OptionValueInfo>
                <NB_Store_OptionValueInfo>
                  <OptionValueID>32</OptionValueID>
                  <OptionID>6</OptionID>
                  <AddedCost>229.00</AddedCost>
                  <ListOrder>14</ListOrder>
                  <Lang>en-AU</Lang>
                  <OptionValueDesc>Upgrade TwinCare 3 Year Ext. Warranty Courier Pickup &amp; Return</OptionValueDesc>
                </NB_Store_OptionValueInfo>
              </OV>
            </O>
          </O>
        </options>
      </P>