Error: Data form could not be loaded. Arithmetic overflow error converting expression to data type nvarchar - when opening a letter

User may receive the following error message when they open letter through the letter search function:
Data form could not be loaded. Arithmetic overflow error converting expression to data type nvarchar
 
Download and install the latest Service Pack which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.  
  Letter search error.jpg

Environment

 Blackbaud CRM
 4.0
 4.0.172.0, Service Pack 12
 4.0.166.0

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