OPM - CEU8 - Workset Location

With a number of application to run, I'd like to separate them at the Workset level by application using:

_USTN_WORKSETROOT      = $(_USTN_WORKSPACEROOT)Worksets/$(_USTN_Product_Shortname)/$(_USTN_WORKSETNAME)/

instead of

_USTN_WORKSETROOT      = $(_USTN_WORKSPACEROOT)Worksets/$(_USTN_WORKSETNAME)/

The moment I do I get no Workset errors and I can't go any further. I wouldn't have thought the configs would be this fragile.

Any reason this would happen and is there a preferred way to do this?

Thanks,