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===== Explanation =====



Usually caused by either corruption or a conversion of a customer, where the Primary and Collections contact info is lost or never entered.



==Resolution==
  - Navigate to the Company.
  - Select the Contacts tab.
  - Make sure Primary and Collections contacts are present.
  - If not, Edit Customer and make sure ther's one Primary and Collections contact.
  - Save the Customer.
  - Preview order again.
  - If Primary and Collections contacts are present.
  - Edit the Customer.
  - Select different Contact as the Primary and Collections contact.
  - Save the Customer.
  - Edit the Customer.
  - Select the original Contact as the Primary and Collections contact.
  - Save the Customer.
  - Preview the order again.