Look in the file
app/code/core/Mage/Sales/Model/Order/Pdf/Items/Invoice/Default.php. That contains the part necessary for product output. Copy the file to a matching directory path but in
app/code/local, this is a safe way to override and make edits. You should be able to see how the
$lines array is used for positioning text.
Try inserting something like this either just before or just after the custom options.
// The quote item doesn't have any product attributes, it is only a quote! $product = Mage::getModel('catalog/product')->load($item->getProductId()); // Use the actual product object to add a new line. $lines = array( 'text' => Mage::helper('core')->__('Manufacturer SKU: ') . $product->getManufacturerSku(), 'feed' => 35 );
You can try to change the position of attribute value by changing the value of feed. For more detail follow this link:-