Using Batch Patron Modification from the Reporting Module is not working correctly
1. Create a report where you query borrower information including cardnumber.
2. Click the option to use batch operations, choosing Batch Patron Modification.
3. Get an error "CardNumber not found" because Koha has actually combined the values of all the patrons in the report into one card number instead of separate ones.
*** This bug has been marked as a duplicate of bug 27142 ***