When a document is created using incorrect key fields, this can be corrected using the keyboard shortcut called “Change Document Keys”. Steps involved changing keys are:
1. Create a data source with the NEW key setup and select any record in the panel.
2. Use the keyboard shortcut “Change Document Keys”
3. Enter a comma separated list of the original key field names
Hit OK – It will prompt to save a log file.
Then use “Adopt Fields” to see if the changes were applied correctly.
Essentially the data new source should have matching content for both the old key and the new key, you need to use the original data source used to create the files to swop the keys.
This process is demonstrated in the following movie: