In \catalog\controller\product\product.php
after
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$data['model'] = $product_info['model'];
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$data['sku'] = $product_info['sku'];
after
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<li class="p-model"><?php echo $text_model; ?> <span class="p-model" itemprop="model"><?php echo $model; ?></span></li>
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<li class="p-model">SKU: <span class="p-model" itemprop="sku"><?php echo $sku; ?></span></li>
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Notice: Undefined variable: sku in.....