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Salesforce Certified Platform App Builder · Salesforce
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The question is about what data type change will require additional steps. If you change the External ID, you'll need to ensure it still works in external systems and the synching of data. The others require additional changes too but are very minor compared to this one.
Correct Ans is A, - You can’t change the data type of any custom field that is mapped for lead conversion. - If you change the data type of a custom field that’s set as an external ID, choosing a data type other than text, number, or email causes the field to no longer act as an external ID.
ANSWER: A. Changing the data type of a field used in lead conversion from number to text. "You can’t change the data type of any custom field that is mapped for lead conversion." This question isn't about data loss, so even though changing from number to text causes no data loss, you still can't perform the action with mapped custom object fields on the lead. Therefore, A custom field mapped in lead conversion would need to be unmapped, converted, then mapped again, causing an additional step in the type conversion process. https://help.salesforce.com/s/articleView?id=sf.notes_on_changing_custom_field_types.htm&type=5