So... After doing some experimentation I found out that to generate a Dimension for a Curtain Wall I would need to fill up in API_Base: node_id, node_status, special (set to true). This is unlike in Wall/Column which I only fill up the InIndex.
Any idea on what the node_id, node_status (it says in the docu its for internal use) are?
Archicad 25 5010 INT FULL
Archicad 26 5002 INT FULL
Visual Studio Professional 2019
Win 10 Pro 64-bit