Link a limit distance mate to a variable

Want to link the min and max values of the limit to global variables.

I right click on the dimension and then click on .

At that point I expected to be able to select between the current value, the min value, and the max value.

Such does not seem to be the case.

If I do select a variable and click OK, I get a popup message.

     Incampatible range of values make these dimensions unlinkable.

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