When adding computers via a computer list to a new filter, the computers are imported to the filter (in this scenario to the Inclusion section), the section for "resources included in this filter" shows the right number of computers added but when looked at the "Filter Membership" section, it shows 0. Although clicking on "Update membership" or even running the "Delta Resource Membership" Update, the filter is not populated with those computers. Trying to add more computers via the imported list those are not added, doesn't update the filter membership.
No errors appear in the Altiris logs and in Altiris profiler.
This is a known issue.
This issue has been reported to the Symantec Development team.
Follow below steps.