I'm using the "Part Number" parameter inside a block of text in my drawing, but when I export it to AutoCAD DXF 2010 format, the text in the exported file shows up as "<PART NUMBER>", instead of displaying the actual part number.
Mine was via Leader text, t was also related to "Replace model References", it would only hapen after using that tool.
The solution was to discconnect the leader and then re-connect the leader, before exporting the file. I never did find a solution to the problem, it just went away with version updates and patches.
Reg Autodesk Product Design Suite Premium 2014 SP1 Build 222 Intel Core i7 (firstname.lastname@example.orgGHz) Windows 7x64 (Home) - 12GB Ram Nvidia GeForce GTX 560 Ti (1Gig - Ver:331.65) Please accept as a solution if it fixes your problem.