As explained in the previous question, Action Plans are a feature that can help users track and manage common client processes. By creating an Action Plan Template with associated pre-determined Tasks, such as reviewing credit & debit card usage, reviewing account payables, and discussing credit needs, users can ensure that these activities are tracked and followed up on in a timely manner. Users can also automate the periodical creation of Action Plans for customer accounts using Process Builder or Apex triggers.

To prevent users from accidentally creating more than one event of such an event type, the Admin should create a validation rule that will stop the user if they attempt to add multiple one-time events. A validation rule is a rule that verifies that the data a user enters in a record meets the standards you specify before the user can save the record. By creating a validation rule, the Admin can ensure that only one event of a certain type can be created for each contact.

The following steps should be taken by the administrator to configure Financial Services Cloud correctly based on the scenario:
Assign the record type to users. You need to assign the new record type to the user profiles or permission sets that need to create or access referrals of that type. You can assign record types by going to Setup > Profiles > Object Settings > Leads > Record Types or Setup > Permission Sets > Object Settings > Leads > Record Types.
Create a new record type Referral' on the Lead object. You need to create a new record type on the Lead object and name it Referral. You can use this record type to distinguish referrals from other types of leads and apply different page layouts, business processes, or validation rules for referrals.
Update the lead page layout. You need to update the page layout for the Referral record type and add or remove fields according to the requirements. You can also make some fields required or read-only on the page layout level. You can edit page layouts by going to Setup > Object Manager > Lead > Page Layouts. Verified Reference: : Salesforce Help Article 3 : Salesforce Help Article [4] : Salesforce Help Article [5]