link drawing note to custom material property

I'm trying to set up my template to display a note which contains the material type and he elevant British Standard.  We're obviously going to have to set up a custom materials file as the standard one wouldn't support this because of how the material properties are configured.  We think we've found a work around based on advice from various forums and instinct but I can't make it work.

I've setup a custom property for the material with he property name British Standard and the Value BS EN 85: 2005

and I've set up a custom property in the template

and pointed he note at it

but when I use the template to create a drawing

the note just comes up blank.

What am I doing wrong?  Any pointers gratefully accepted.

Cheers

Gary

*All pics redacted to protect identities.

SolidworksDrawings And Detailing