foreignkey null.

[Mauricio CASTRO]

Hi,

How can I do if in some cases I want productGroup to be null?
I set productGroupId to null?


      <reference-descriptor
         name="productGroup"
         class-ref="org.apache.ojb.broker.ProductGroup"
      >
         <foreignkey field-ref="productGroupId"/>
      </reference-descriptor>


Thank you, Mauricio Castro.

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