Adding Zone Information to Spaces for IFC Export

I am following the AECOsim Building Designer V8i COBie User Guide (rev 15 March 2013) with the aim of adding zone information to spaces as per section 5.2.

I have followed the steps and created zones under the IfcZone catalog type but when I place a space or modify an existing one the IfcZone Name field is not available for editing even though it can be seen as a field in the Datagroup Explorer.

IFC_PROJECT = 2

Thanks,
Thomas

ABD SELECT Series 4 0.11.09.593
GB Dataset