Merge Letter error: The file could not be downloaded. Error merging process output: Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.

When trying to merge a letter on a Prospect summary form the following error occurs:  The file could not be downloaded. Error merging process output: Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.
We are currently evaluating this issue for a fix in a future service pack 

Steps to Duplicate

1. Click on the Marketing and Communications tab 
2. Click Manage correspondence
3. Find a Prospect Summary Form, click on that form
4. Attempt to Merge Letter, see error

Environment

 Blackbaud CRM
 3.0
 3.0.516 Service Pack 14

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