Problem with XML MAP NHIBERNATE

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C#

ASP.NET

SQL

.NET

I can't insert data into my table with nhibernate. My tables are Campaign and CampaignVendor

The Campaign table has columns:

Id
Name
VendorId

And CampaignVendor has

Id -Pk
CampaignId -FK
VendorId -FK

I try to map xml with this file below

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
                   assembly="Hcl.Mam.Core"
                   namespace="Hcl.Mam.Core"&gt;
  <class name="Campaign" table="dbo.Campaign">
    <id name="Id" column="Id" unsaved-value="0">
      <generator class="hilo" />
    </id>
        <property name="Name" column="Name" />
        <many-to-one name="Vendor" column="VendorId" class="Vendor" />
      <bag name="AditionalVendors" table="CampaignVendor" cascade="save-update" lazy="false">
      <key column="VendorId" />
      <many-to-many class="Campaign" column="CampaignId" />
    </bag>
   </class>
</hibernate-mapping>

However, it doesn't work or show me an error message.

The column Id in table CampaignVendor does not allow null values.
inst possible generate the pk into CampaignVendor...

How can i solve this?