PreparedStatement error using VPD

Hi all,
Our team is developing an application using an Oracle DB 9.2.0.4 and BC4J 10g (9.0.5.16.0) as persistence layer.
We also are using the VPD (virtual private database) to have security in the database at row level.
The problem we are facing is that every some time (days) we get a jdbc error when a query (see below) that uses VPD policies is executed. Once the error occurs I execute it from sqlplus without getting any error .. it only occurs from our java application.
To temporary solve this problem, we delete and recreate the VPD policies, then the application continue working fine for some time ...
I'll appreciate any comment / suggestions
Thank in advance.
Eduardo.
ERROR LOG:
oracle.jbo.SQLStmtException: JBO-27122: SQL error during statement preparation. Statement: SELECT * FROM (SELECT CalLocation.ID,
CalLocation.CODE, eo
CalLocation.NAME,
CalLocation.ZIP,
CalLocation.PHONE,
CalLocation.FAX,
CalLocation.ADDRESS1,
CalLocation.ADDRESS2,
CalLocation.URL,
CalLocation.OWNER,
CalLocation.CTY_ID,
CalLocation.DESCRIPTION,
ORefCity.CODE CTY_CODE,
ORefCountry.ID CTR_ID,
ORefCountry.CODE CTR_CODE,
ORefRegion.ID REG_ID,
ORefRegion.CODE REG_CODE
FROM CAL_LOCATIONS CalLocation,
OREF_CITIES ORefCity,
OREF_COUNTRIES ORefCountry,
OREF_REGIONS ORefRegion
WHERE ORefCity.ID = CalLocation.CTY_ID
and ORefCountry.ID = ORefCity.CTR_ID
and ORefRegion.ID = ORefCountry.REG_ID) QRSLT WHERE ( ( (CTY_ID = 867) ) )
## Detail 0 ##
java.sql.SQLException: Io exception: Broken pipe
     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:189)
     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:231)
     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:345)
     at oracle.jdbc.driver.OracleStatement.open(OracleStatement.java:717)
     at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:2605)
     at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:457)
     at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:387)

It seems to be related to the bug 3662364 .
Regards,
Eduardo.

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