Iam exporting a DDT from control expert (.XVM format) and importing the same file in vijeo designer v6.2 by using "link variables..." , By this method all the variables are importing in the Vijeo designer variables list, but the tag address are populated as %UV43..... due to this, whenever I re-build my PLC program after modification, the communication error comes in HMI and thus HMI stops communicating with the PLC.
You should also be able to export your variables as a .txt file. Importing that into vijeo (instead of linking the variable mapping file) should result in all %MW address, I don't remeber how that handles DDTs however...