Chances are it has happened to you when you received drawings from someone else, you have dimensioned components but something does not add up. Hopefully you notice there is a discrepancy and the person has cheated with dimension value overrides, or you could be headed for a headache in fabrication or construction. Stephen Preston Autodesk DevTech Americas Manager wrote a nice plugin that will help you identify these overridden dimensions as well as including all the source code to see how it was accomplished.
Follow the instructions to download and load using the AutoCAD command NETLOAD.
Example: Set DIMPATROL value to 1 then check out the drawing and you see the suspect dimensions highlighted in red transparent highlights