Scheduling multiple erratas from Satellite throws tracebacks with error 'duplicate key value violates unique constraint "rhn_sp_snep_uq"'

Issue

• Scheduling Errata from Satellite throws tracebacks as below,

 File "/usr/lib/python2.6/site-packages/spacewalk/server/apacheRequest.py", line 123, in call_function
    response = apply(func, params)
  File "/usr/share/rhn/server/handlers/xmlrpc/registration.py", line 925, in update_packages
    server.save_packages()
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnServer/server_wrapper.py", line 75, in save_packages
    ret = self.save_packages_byid(self.server["id"], schedule=schedule)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnServer/server_packages.py", line 228, in save_packages_byid
    h.execute_bulk(package_data)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnSQL/sql_base.py", line 197, in execute_bulk
    ret = ret + apply(self.executemany, (), subdict)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnSQL/sql_base.py", line 172, in executemany
    return apply(self._execute_wrapper, (self._executemany, ) + p, kw)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnSQL/driver_postgresql.py", line 273, in _execute_wrapper
    retval = apply(function, p, kw)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnSQL/driver_postgresql.py", line 310, in _executemany
    self._real_cursor.executemany(self.sql, all_kwargs)
IntegrityError: duplicate key value violates unique constraint "rhn_sp_snep_uq"

• Activating satellite certificate after upgrading satellite using command rhn-satellite-activate throws following tracebacks

Exception Handler Information
Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/spacewalk/server/apacheRequest.py", line 123, in call_function
    response = apply(func, params)
  File "/usr/share/rhn/server/handlers/xmlrpc/registration.py", line 925, in update_packages
    server.save_packages()
  File "/usr/lib/python2.4/site-packages/spacewalk/server/rhnServer/server_wrapper.py", line 75, in save_packages
    ret = self.save_packages_byid(self.server["id"], schedule=schedule)
  File "/usr/lib/python2.4/site-packages/spacewalk/server/rhnServer/server_packages.py", line 228, in save_packages_byid
    h.execute_bulk(package_data)
  File "/usr/lib/python2.4/site-packages/spacewalk/server/rhnSQL/sql_base.py", line 197, in execute_bulk
    ret = ret + apply(self.executemany, (), subdict)
  File "/usr/lib/python2.4/site-packages/spacewalk/server/rhnSQL/sql_base.py", line 172, in executemany
    return apply(self._execute_wrapper, (self._executemany, ) + p, kw)
  File "/usr/lib/python2.4/site-packages/spacewalk/server/rhnSQL/driver_postgresql.py", line 273, in _execute_wrapper
    retval = apply(function, p, kw)
  File "/usr/lib/python2.4/site-packages/spacewalk/server/rhnSQL/driver_postgresql.py", line 310, in _executemany
    self._real_cursor.executemany(self.sql, all_kwargs)
IntegrityError: duplicate key value violates unique constraint "rhn_sp_snep_uq"