[Ed B.]

I think the problem comes from the following. In XLite/Model/Product.php, we have

    /**
     * Product price
     *
     * @var float
     *
     * @Column (
     *      type="money",
     *      precision=14,
     *      scale=4,
     *      options={
     *          @\XLite\Core\Doctrine\Annotation\Behavior (list={"taxable"}),
     *          @\XLite\Core\Doctrine\Annotation\Purpose (name="net", source="clear
"),
     *          @\XLite\Core\Doctrine\Annotation\Purpose (name="display", source="n
et")
     *      }
     *  )
     */
    protected $price = 0.0000;

whereas in XLite/CDeV/Sale/Model/Product.php we have

    /**
     * "Sale value"
     *
     * @var float
     *
     * @Column (type="decimal", precision=14, scale=4)
     */
    protected $salePriceValue = 0;

A solution would be modify the type of "Sale Value" to "money".