You can delete a Contact under the condition that there is no history in Prima associated against the Contact.
If there is no history, you can delete the Contact by doing the following:
Enter into the Company Record
Double click into the Contact
Ensure the focus is around the Contact section
Click the Delete Icon
The Contact will now be deleted and the next contact will be loaded onto the screen.
*If there is history against the contact an error message will be returned to indicate that this cannot be deleted.