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one-to-one mapping

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I am trying to map Account object to Transaction object.

I have a ReferenceId (type:long) field in Transaction which should hold the AccountId

The accountid is the primary key for Account and is of type long.

The mapping for Account is

<one-to-one name="Transaction" class="a.b.Transaction" cascade="save-update" fetch="select" property-ref="ReferenceId" />

When the account object is saved the ReferenceId is always set as 0.

can any one help me figure out why?

Any help or comments would he highly appreciated.
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