EntityManagerImpl entityManagerFunctionConta = (EntityManagerImpl) GermantechEntityManager.getEntityManager();
    EntityTransaction transactionFunctionConta = entityManagerFunctionConta.getTransaction();
    String functionConta = "CREATE OR REPLACE FUNCTION saldo_anterior_conta(dt_inicial date, id_conta bigint, id_empresa bigint) " +
     "RETURNS numeric AS " +
     "$BODY$ " +
     "declare " +
     "saldo_anterior numeric(14,2);" +
     "begin " +
     "select coalesce(sum(valor), 0) into saldo_anterior " +
     "from saldoinicialconta " +
     "where data < dt_inicial and empresa_id = id_empresa and conta_id = id_conta; " +
     "return saldo_anterior;" +
     "end;" +
     "$BODY$ " +
     "LANGUAGE plpgsql VOLATILE COST 100;" +
     "ALTER FUNCTION saldo_anterior_movimentacao(date, bigint, bigint) OWNER TO postgres;";

    transactionFunctionConta.begin();
    entityManagerFunctionConta.createNativeQuery(functionConta).executeUpdate();
    transactionFunctionConta.commit();

    Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.1.v20121003-ad44345): org.eclipse.persistence.exceptions.DatabaseException
    Internal Exception: java.sql.BatchUpdateException: Entrada em lote 1 <unknown> foi abortada. Chame getNextException para ver a causa.
    Error Code: 0
    	at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:324)
    	at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeJDK12BatchStatement(DatabaseAccessor.java:882)
    	at org.eclipse.persistence.internal.databaseaccess.DynamicSQLBatchWritingMechanism.executeBatchedStatements(DynamicSQLBatchWritingMechanism.java:144)
    	at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.writesCompleted(DatabaseAccessor.java:1714)