CE WorkSet warnings.

Our Company users should be able to open design files i any WorkSpace/ WorkSet without warnings.

Setting  MS_WORKSETMISMATCH_ALERT_EXCLUDE_VARS_ALLLEVELS= $(_DGNDIR) does not work.

Setting MS_WORKSETMISMATCH_ALERT_EXCLUDE_VARS_WORKSPACELEVEL= $(_DGNDIR) does not work.

Why not?

How to resolve?