IfcDoc - Add Propertyset to Concept Templates

Hi all,

I would like to ask about how to add property-set in the Query panel when creating a concept template.

I am using IfcDoc (v12.1) and try to create a new concept template.
Whenever I select the property and click OK on the “Select Property” pop-up, it shows an error message.

The following figures are screen captures of that - to define “IsExternal” property of Wall (in Pset_wallcommon)

Do I have to define property-set only in “Select Mode”?
In this case, I have to input the attributes of IfcPropertySingleValue (IsExternal, True) manually.

If anyone can help please, it would be greatly appreciated !!

Thanks in advance!
Jihye