interface Product
class AbstractProduct implements Product
class BasicProduct extends Product implements Donatable

interface Donatable
class BasicProduct extends Product implements Donatable
class Lot implements Donatable

select from Donatable

select from Product

net.sf.hibernate.MappingException: duplicate import: BasicProduct

<class name="com.atwoodsoft.data.Donatable" table="Donatable">
    <id name="id" type="int" column="id" unsaved-value="-1">
      <generator class="native"/>
    </id>
    <joined-subclass name="com.atwoodsoft.data.Lot" table="Lot">
      <key column="donatable"/>
      <many-to-one name="product" class="com.atwoodsoft.data.Lottable" column="product"/>
      <property name="lotNumber" column="lotnumber" type="string"/>
      <property name="expirationDate" column="expirationdate" type="date"/>
    </joined-subclass>
    <joined-subclass name="com.atwoodsoft.data.Stock" table="Stock">
      <key column="donatable"/>
      <property name="quantity" type="int" not-null="true"/>
      <property name="stockNumber" type="string" not-null="true"/>
      <many-to-one name="shipment" class="com.atwoodsoft.data.Shipment" column="shipment"/>
      <many-to-one name="lot" class="com.atwoodsoft.data.Lot" column="lot"/>
    </joined-subclass>
    <joined-subclass name="com.atwoodsoft.data.BasicProduct" table="Product">
      <id name="id" type="int" column="id" unsaved-value="-1">
        <generator class="native"/>
      </id>
      <key column="donatable"/>
      <discriminator column="subclass" not-null="true"/>
      <many-to-one name="manufacturer" class="com.atwoodsoft.data.Manufacturer" column="manufacturer"/>
      <many-to-one name="priceSource" class="com.atwoodsoft.data.PriceSource" column="pricesource"/>
      <property name="unitValue" column="unitvalue" type="int"/>
      <one-to-one name="packaging" cascade="all" constrained="false"/>
      <one-to-one name="name" cascade="all" constrained="false"/>
      <one-to-one name="description" cascade="all" constrained="false"/>
    </joined-subclass>
  </class>
<class name="com.atwoodsoft.data.Product" table="Product">
    <id name="id" type="int" column="id" unsaved-value="-1">
      <generator class="native"/>
    </id>
    <discriminator column="subclass" not-null="true"/>
    <many-to-one name="manufacturer" class="com.atwoodsoft.data.Manufacturer" column="manufacturer"/>
    <many-to-one name="priceSource" class="com.atwoodsoft.data.PriceSource" column="pricesource"/>
    <property name="unitValue" column="unitvalue" type="int"/>
    <one-to-one name="packaging" cascade="all" constrained="false"/>
    <one-to-one name="name" cascade="all" constrained="false"/>
    <one-to-one name="description" cascade="all" constrained="false"/>
    <subclass name="com.atwoodsoft.data.BasicProduct" discriminator-value="p"/>
    <subclass name="com.atwoodsoft.data.Lottable">
      <set name="lots" cascade="all" inverse="true" lazy="false">
        <key column="product"/>
        <one-to-many class="com.atwoodsoft.data.Lot"/>
      </set>
      <subclass name="com.atwoodsoft.data.LottedProduct" discriminator-value="l"/>
      <subclass name="com.atwoodsoft.data.DrugProduct" discriminator-value="d">
        <property name="dossageSize" column="dossageSize" type="int"/>
        <many-to-one name="generic" class="com.atwoodsoft.data.GenericDrug" column="generic"/>
        <many-to-one name="dossageUnit" class="com.atwoodsoft.data.Unit" column="dossageunit"/>
      </subclass>
    </subclass>
  </class>