19.21Ask about manually edited Salesforce fields

Critical question:

“Which fields may Salesforce users edit manually?”

Then:

“Should the next source synchronization overwrite those edits?”

Example:

ERP owns:
Legal_Name__c

Salesforce reps own:
Notes
Account_Manager__c

Your DataWeave should map only source-owned fields.

Do not send a giant Account object full of nulls.