You can construct this dimension (while I've never had ocation to do it myself) by removing the dim text from the exsisting dim and adding a parametric note pointing to the dimension arrow.
Here' how... (in Pro/E 2001 that is...)
Select the dimension, right click, select PROPERTIES
Select the Dimension Text tab
Replace the @D with @O (the letter O not the number 0)
For furture reference, note the NAME of the dimension in the first box under the big note box. (in my test it was d31)
When you click OK the dimension text should disapear.
Now create a parametric note that points to the dimension by using
INSERT>NOTE>LEADER>MAKE_NOTE>FREE_POINT>NO_AR ROW
Click the location at the center of the dimension arrow, which should now give you a prompt for text. Enter the andpersand (&) and the NAME of the dimension you omitted in the previous step (ex: &d31). If the dim requires a symbol (diameter, radius, degrees, etc, you should add that as well with the symbol pallet)
When you hit enter the note should have the correct dimension value.
NOTE: since you can't attach the note to the dimension arrow, the note will stay where you placed it. If you move your drawing view, this note will not follow it.