Why Hibernate is binding same parameter twice for entity identity column ?

Issue

• Why Hibernate is binding same parameter twice in SQL statement when trying to persist an entity mapped with read-only identity @Column and throwing SQL exception caused by "Parameter index is out of range"?
• Why application is throwing "Parameter index is out of range" error on DB2 database ?

Caused by: com.ibm.db2.jcc.am.SqlSyntaxErrorException: [jcc][10145][10844][4.11.88] Invalid parameter 4: Parameter index is out of range. ERRORCODE=-4461, SQLSTATE=42815
    at com.ibm.db2.jcc.am.gd.a(gd.java:676)
    at com.ibm.db2.jcc.am.gd.a(gd.java:60)
    at com.ibm.db2.jcc.am.gd.a(gd.java:103)
    at com.ibm.db2.jcc.am.ln.e(ln.java:5080)
    at com.ibm.db2.jcc.am.ln.d(ln.java:5073)
    at com.ibm.db2.jcc.am.ln.a(ln.java:1362)
    at com.ibm.db2.jcc.am.ln.setString(ln.java:1351)
    at org.jboss.jca.adapters.jdbc.WrappedPreparedStatement.setString(WrappedPreparedStatement.java:637)
    at org.hibernate.type.descriptor.sql.VarcharTypeDescriptor$1.doBind(VarcharTypeDescriptor.java:57) [hibernate-core-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
    at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:92) [hibernate-core-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
    at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:280) [hibernate-core-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
    at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:275) [hibernate-core-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
    at org.hibernate.type.ComponentType.nullSafeSet(ComponentType.java:358) [hibernate-core-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
    at org.hibernate.persister.entity.AbstractEntityPersister.dehydrateId(AbstractEntityPersister.java:2814) [hibernate-core-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
    at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:2783) [hibernate-core-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3055) [hibernate-core-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]