In the Plantsight environment, the issue can be seen that after exporting the excel from PlantSight, editing the excel file & importing back the same. Attached the error message below
This wiki article explains the steps on how to import the excel after doing changes in exported excel sheet.
If above problem still persists, then please create a Service Request and contact the Bentley Product Advantage group. Please include a list of all relevant details to get in depth analysis for a solution or workaround