Overview:

On a business Account Call, the Call Attendees section does not return any results.

Root Cause:

The Business Professional record type is active. This would only return Business_Professional_vod accounts that have the same primary parent as the business account and match search criteria.

Solution:

Deactivate the Business_Professional Record Type.

To do this, follow these steps:

1. Navigate to: Setup --> Customize --> Accounts --> Person Accounts --> Record Types. 
2. Click on Business_Professional_vod --> Edit.
3. Disable (uncheck) the Active checkbox.
   
   

Related Documentation:

CRM Help Documentation: Adding the Business Professional Entity Record Type