how to delete obsolete objects from the Obsolete object structure
If I remember correct; you should be able to just delete them like any other object.
I believe the Obsolete Structure was some attempt by Control Builder M to have a "undo" function; however, it was discontinued and is no longer used in the current version of 800xA.
On the other thread I see that you have had issues with FSD - I think you should still be able to delete the objects.
What error did you get?
Is the problem solved now?
I checked in my lab; apart from CBM the Obsolete Structure was also used by various uploaders, e.g. 800xA for Advant Master.
Before deleting obsoleted objects, they were exported and placed in a Obsolete Objects aspect on an object in the Obsolete Structure carrying the date of the upload.
[Obsolete objects created by some uploader in SV 5.0]
[Obsolete objects created by Control Builder M in SV 4.1]
In any case, the objects can be deleted. No feature was ever made to assist you to recover these objects (apart from manually opening and importing them from the AFW file contained by the Obsolete Objects aspect).