After upgrade from SMP 7.5 SP1 HF5 to SMP 8.0, Old Pluggable Protocol agent PPA became stale, causing an error while refreshing packages codebases. and fails to get deleted.
Updating package codebase failes, package "Pluggable protocol Agent 7.5_SP1_HF5 package" file not found.
Upon upgrade 7.5 SP1 HF5 PPA package becamse stale and failed to be deleted, and an association to new PPA package advertisment was created.
It's safe to delete the association/reference of the old PPA package. To do this open SQL Management Studio on the SQL server and run the following query on the Altiris database:
DELETE FROM ItemReference
WHERE ParentItemGuid = '85BDC2ED-4291-4B53-9E21-90374FF24626'
After deleting the reference go to the console under Manage>All Resources>Packages and then delete the old PPA packages.