Issue:
When you save drawings to a previous version of AutoCAD, and then send them to customers, your customers are confused by the Proxy Information warning. You want to remove the proxy objects when you save the drawings.
Solution:
You cannot save a drawing to a previous release without including proxy objects. This feature allows a drawing to be saved back and then reopened in newer versions without losing the functionality of the latest features and objects.
For example, in AutoCAD® 2007, you can create Table and Field objects. If you save the drawing in AutoCAD 2000 format, and then open it in AutoCAD 2002, you will receive a Proxy warning because AutoCAD 2002 does not have Table and Field objects. However, after you make modifications in AutoCAD 2002 and reopen the file in AutoCAD 2007, the Table and Field intelligence is not lost because of the roundtrip functionality.