In Lightning Data rules that update fields on your records via a
lookup to a custom object, you can replace old data with new information automatically: In
Setup, select a new field mapping option for existing values. Previously, when sales reps
updated accounts, contacts, or leads, Lightning Data could only fill empty fields. It couldn’t
update fields that already contained data—even if the data was out-of-date. Now, sales reps no
longer have to click a link to see the latest data, such as head count, revenue, or contact
information. And with this automation, your sales team enjoys better segmentation, more
comprehensive reporting, and easier task assignment.
Where: This change applies to Lightning Experience and Salesforce Classic in Enterprise,
Performance, Unlimited, and Developer editions.
How: In Setup, use the Quick Find box to find Data Integration
Rules and open a rule that updates records. In the rule’s field mapping
settings, select Update. On each field, select
Overwrite or Keep. Before selecting Overwrite,
enable history tracking for the field.