I can't seem to use a custom property filter for this list. Basically I created custom property called AL (with a text value of either yes/no) so that the list will only show access layer devices.
Here's the filter I use for the reqource; AL = 'Yes'
..it returns with this error;
This resource uses SWIS as a data provider and therefore expects a SWQL filter. To make your query work, try using "N.CustomProperties.AL = Yes"
N is for Nodes assuming the custom property is on a node. If you have other customer properties, simply change AL to whatever they are (ex: State).