I've had this problem for quite some time.  I've just never asked about it until now.  I couldn't find where anyone else had asked about it either.

I regularly link dimension values together using the "Link Value" command.  I either link a dimensions to a linked value, or a global variable.

For example, on plastic parts, I may link most of the general fillet radius values to a linked value of "General Fillet".  Or, I may create a global variable with the same name and link the fillet dimensions to this.

This works great generally.  However, I regularly encounter the following message:

This makes no sense to me as the values are identical to begin with.  I'm just trying to link them together so that if any one of them change, they will all change.

What's strange is I can create equations to drive all related dimensions down the tree to the first instance of the value.  But this can make your equation editor very cluttered with simple y=x equations when a linked value should be sufficient, especially if there are many of these values.  Plus, by using equations, you must always find the "driving" dimension to change rather than changing any of these dimensions.  This becomes cumbersome.

I see this most often if I'm trying to link for example a sketched angle dimension with a draft feature angle dimension.  Or, a sketched radius dimension to a fillet feature radius dimension.  In either of these scenarios, the values should be linkable as far as I'm concerned.  Does anyone know why I get this message when I'm trying to link identical values?