Why can't I update old records because a new field is required?

Why can't I update old records because a new field is required?

When a new field is added and marked as required, it must have a value before any record can be saved, even if you’re not editing that specific field.

When you edit a record, the system checks all required fields. If any are empty, the record can’t be saved.

How to fix it

• Assign a value to the new required field: Edit each affected record so the new field has an appropriate value. 
• Bulk update: System Administrators can use CSV imports or Mass Edit to assign a value to all affected records at once. For more information read the article 'CSV Imports'. 

Tip: To prevent future issues, make sure existing records are populated with a suitable value before marking a new field as required or update them immediately after making it required.