If you can help, I would truly appreciate it. My system crashed and once I recovered the drawing; it appeared to be a earlier version than what I wanted. So I went to my auto save folder and retrieved a version that was only 5 mins old. Once I purged the old drawing out and imported the new drawing in, as you can see in the pic, the system is showing a "?" behind the heat exchanger as if there's another one using the same number. Problem is, there's not. Please advise?
I had a similar issue. The only solution I found was to export data from my Data Manager to Excel, Find and replace all "?" with "" and import the Excel file back to Plant.
What you could try also is to Purge the Cache. For Plant 2014 and 2015 the tool is @
C:\Program Files\Autodesk\AutoCAD 2014\PLNT3D\PnPLocalDataCachePurger
Let me know if this helps.
Kr,
Jedrzej