<list name="currenciesDiffMin" lazy="false">
           <key column=""/>
           <one-to-many class="ECurrenciesDiffmin"/>
        </list>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
<class name="com.intesasanpaolo.tps.model.ECurrenciesDiffmin"
      table="TPS25_CURRENCIES_DIFFMIN" catalog="@CATALOG@" mutable="true">
      <comment>Oggetto hibernate che mappa la tabella TPS25_CURRENCIES_DIFFMIN</comment>
      
      <composite-id>
         <key-property name="confId" type="string">
            <column name="TPS16_ID"></column> <!-- This is the foreign key. It refers to TPS16_CONFIGURATION.TPS16_NAME field -->
          </key-property>
          <key-property name="currency" type="string">
             <column name="TPS25_ISO_CURRENCY"></column>
          </key-property>
      </composite-id>
      
      <property name="diffMin" type="double">
         <column name="TPS25_DIFF_MIN" not-null="false" />
      </property>
      
</class>      
</hibernate-mapping>

package com.intesasanpaolo.tps.model;

public class ECurrenciesDiffmin {
   
   private String confId;
   private String currency;
   private double diffMin;
   
   public ECurrenciesDiffmin() {
      super();
   }
   
   public ECurrenciesDiffmin(String confId, String currency, double diffMin) {
      super();
      this.confId = confId;
      this.currency = currency;
      this.diffMin = diffMin;
   }
   public String getConfId() {
      return confId;
   }
   public void setConfId(String confId) {
      this.confId = confId;
   }
   public String getCurrency() {
      return currency;
   }
   public void setCurrency(String currency) {
      this.currency = currency;
   }
   public double getDiffMin() {
      return diffMin;
   }
   public void setDiffMin(double diffMin) {
      this.diffMin = diffMin;
   }

}

<list name="currenciesDiffMin" lazy="false">
           <key column="confId"/>
           <one-to-many class="ECurrenciesDiffmin"/>
        </list>

Table: TPS16_CONFIGURATION

Column:
TPS16_CONF_ID (PK)
TPS16_CONF_NAME
..........

Table: TPS25_CURRENCIES_DIFFMIN

Column:
TPS16_CONF_ID
TPS25_ISO_CURRENCY

P.K - Both Columns

public class TPS16 {

private List Class_For_TPS25; (Represents 1-to-many )
.............
}

public class Class_For_TPS25 {

private TPS16 tps; (Represents many-to-1)
private String TPS25_ISO_CURRENCY;
.........
}

<class name="TPS16" table="TPS16_CONFIGURATION ">

<id name="TPS16_CONF_ID" type="long" column="TPS16_CONF_ID">
  <generator class="native"></generator> (Populate as per ur need)
</id>

<list name="Class_For_TPS25" inverse="false"  cascade="none">
  <key column="TPS16_CONF_ID"  />         
  <list-index column="COL_USED_FOR_SORTING_WHEN_POPULATING_LIST_OBJECT" />                     
  <one-to-many class="Class_For_TPS25" />           
</list>

else u can also use below (list vs bag tag works for java.util.List types)

<bag name="Class_For_TPS25" inverse="false"  cascade="none">
   <key column="TPS16_CONF_ID"  />                         
   <one-to-many class="Application" />           
</bag>

<class name="Class_For_TPS25" table="TPS25_CURRENCIES_DIFFMIN">

<composite-id>
        <key-property name="TPS25_ISO_CURRENCY"/>
        <key-many-to-one name="TPS16_CONF_ID"/>
</composite-id>
.............
.............