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as per this thread similar issue
What is the parameter used to display revision and iteration in one field on the drawing?
&PTC_WM_VERSION:D
The ":D" on the end is the the drawing version
Don't use the ":D" for the current model version
Look in Tools-Parameters of your drawing file to get the Windchill parameter names. Using the name with the ':D' on the end will pull the parameter from the drawing. Using :MDL will pull the parameter from the active model on that sheet.