Northern Trail Outfitters wants to change a master-detail relationship onAccount to a lookup relationship with...

When attempting to change a master-detail relationship to a lookup relationship, Salesforce imposes specific restrictions to maintain data integrity:

C. The Account record includes Parks roll-up summary fields. Master-detail relationships allow roll-up summary fields to aggregate data from child records onto the parent record. If any roll-up summary fields are present on the master object (Account in this case) that depend on the detail records (Parks), the relationship cannot be changed to lookup until these roll-up summary fields are removed.

To resolve this, follow these steps:

Identify and delete all roll-up summary fields on the Account object that reference the Park object.

Convert the master-detail relationship to a lookup relationship.

Recreate any necessary roll-ups using declarative tools like Process Builder or Flow if needed, as lookups do not support native roll-up summaries.

For more guidance, review Salesforce's documentation on Changing Field Types.