Problem Linking Variable to Custom Property

I am having problems linking varibles to custom properties.  For the most part it works, but I have found that if I have a variable which is not linked to a control on a data card, the value will not propagate to the custom properties.  For example, if I have a 'Set Variable' action that sets a 'DWG_REVISION' variable to '%nextrevision%', and the 'DWG_REVISION' variable has an Attribute named 'Revision' in the block 'CustomProperty', the action never occurs.  The file will go through the transition and the drawing file will not have a 'Revision' custom property.  If I add an Edit Box to the drawing card and link the box to the 'DWG_REVISION' variable, passing through the transition will now trigger the action and the custom property appears.

I assume that this is by design.  If so, it seems like a silly restriction.

Jim S.

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