Hey toca,
Do You use 7.1.SP1 Patch and newer? If Yes, there is no more Applicability Rules as it was before. Vulnerability Assessment results can be troubleshooted on Client.
You can read assessment detailed log, directly on client, which is stored in C:\Program Files\Altiris\Altirtis Agent\Agents\SoftwareManagement\Software Delivery\{6D41....}\cache\StPAtchAssessment.xml
However, applicability rules cannot be modified in any way.
Thanks,
Sergej