If you have a search running on a schedule and you subsequently add/remove or rename columns in the search (via NetSuite UI) your searches will fail until you manually rerun them in the application at least one time. This is required in order to ensure that formulas are not broken by a scheduled search and that the user has an opportunity to fix them prior to the next scheduled run.
Mismatch in headers of saved search and Excel table
Reason of Error
User edited NetSuite Saved Search (remove, added, or renamed columns)
Two or more columns have the same name
How to validate
Click preview and the screen is not loading
When the saved search is downloaded there is the same name with an added number to it
Step 1: Update NetSuite Saved Search and use the custom label or summary label and make field names unique.
Step 2: Manually refresh the data in excel to get the latest configuration of the saved search from NetSuite.