Red Hat Satellite upgrade from 5.4 to version 5.7 fails

Issue

• Upgrade Red Hat Satellite from 4.5.1 to 5.7 fails with following error messages:

# ./install.pl --upgrade --skip-selinux-test
[...]
* Database: Starting Oracle to PostgreSQL database migration.
** Database: Starting embedded Oracle database.
** Database: Trying to connect to Oracle database: succeded.
** Database: Migrating data.
*** Database: Migration process logged at: /var/log/rhn/rhn_db_migration.log
*** Data migration failed.  Exit value: 3.
Please examine /var/log/rhn/rhn_installation.log for more information.

# cat /var/log/rhn/rhn_db_migration.log
Running: psql -U rhnuser -d rhnschema -v ON_ERROR_STOP=ON -f -
psql:<stdin>:1: ERROR:  syntax error at or near "Package"
LINE 1: Package rhn-upgrade detected, which may lead to errors during...