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Hibernate version: 3.2

Hi, I've got a problem when I use property-ref attribute. My acse is:

Table 1
ID (PK)
COL_1 (UNIQUE)
COL_2
COL_3

Table 2
ID (PK)
COL_1
COL_4
COL_5

Then, for table 2 i Have:
<many-to-one
name="col1"
class="ar.org.Table1"
property-ref="col1"
column="col_1"
update="true"
insert="true"
cascade="none"
not-null="true"/>

So, when update table 2, hibernate too update table 2. Can someone help me, pls ?