PlatePartGeometry is missing CreatePlatePart_AE and is unable to Update.
There is a plate part whose geometry has no active entity and therefore cannot be updated: Missing the StructOperation_RSLT1 relationship to (GeneratePlatePart_AE, PlateStrakingSplit_AE, SDCutAE, PlateFinalTrim_AE, or ChamferCut_AE) for detailed PlatePartGeometry.
You cannot manipulate the object itself or other objects related to it.
The geometry will not be updated.
What You Should Do
Ask your database administrator to back up the model.
Supply all information possible that may have led to this situation, and submit this information along with the backup to Smart 3D Support.
Run the Clean Database custom command to delete the object.