First of all: hands OFF SU22. That is for SAP and in older releases you could actually change things there. You must maintain SU24 and not SU22. There is no valid reason to change SU22 even if some old SAP notes mention that.
You can use report SU24_AUTO_REPAIR to correct the entries (read the SAP notes and check your version!) if they are transferred into SU24.
But unless they cause inconsistencies, these entries are harmless.
The background is that SAP uses transaction CHECKMAN to evaluate the capability of transactions to object checks and field values and transfer them from the kernel trace to SU22. If the SAP developers did not process the CHECKMAN, then the entries are "unclassified".
In SAPs own systems this translates to "no check".
In customer systems this translates to "check" or the same as if the object was not listed at all.
Cheers,
Julius