No, Installing CCH ProSystem fx Engagement on a server that is also a Domain Controller is not supported.

Note: Microsoft does not recommend installing SQL Server on a Domain Controller. For information on this topic, please refer to the following articles:

• http://msdn.microsoft.com/en-us/library/ms143506.aspx
• http://msdn.microsoft.com/en-us/library/ms144228(SQL.90).aspx