This is my first post, so I hope I am doing this right and I am in the right place, haha, but...
I am working with a customer where they wish to have their Assignment Group field populate with a default value if the Custom Property we created for this isn't configured for the device. Currently my SWQL query is as follows:
${SWQL: SELECT
CASE When n.customproperties.SNOW_AssignmentGroup is null Then '[Assignment Group Default They Provided Here]'
ELSE n.customproperties.SNOW_AssignmentGroup
End as CP
FROM Orion.Nodes N
Where N.NodeID =${N=SwisEntity;M=NodeID}}
I have validated the query in their system outside of the "${SWQL:}" wrapper and "Where N.NodeID =${N=SwisEntity;M=NodeID}", and only have that applied on the query in the field I am putting it in. 
When testing this, the Assignment Group isn't coming into their SNOW as the expected behavior. I am not sure what I may be missing here, so any and all help would be greatly appreciated!