Description of problem:
Page throws ISE.

Version-Release number of selected component (if applicable):
Any Spacewalk/Satellite build after 6/1/09

How reproducible:
Always

Steps to Reproduce:
1. Click on the SDC > Alter Channel Subscriptions
  
Actual results:
ISE (detail below)

Expected results:
Alter channel subs page

Additional info:
Looks like it was a result of the schema change 121-rhnReleaseChannelMap.sql. In that change, the rhnReleaseChannelMap is_default column was removed. However, at least one of the queries that the alter channel subscriptions page setup uses (Channel_queries.base_eus_channels_by_version_channel_arch) still references the is_default column, causing an exception reading:

java.sql.SQLException: ORA-00904: "RCM"."IS_DEFAULT": invalid identifier