I have a CDT with a number of fields one of which is a number. I wish to displayhttps://community.appian.com/discussions/f/general/1614/i-have-a-cdt-with-a-number-of-fields-one-of-which-is-a-number-i-wish-to-displayI have a CDT with a number of fields one of which is a number. I wish to display the sum of this field as the default value in a form and have used the sum() function e.g. =sum(statement.amount). This however results in an ERROR:An error occurred whileen-USTelligent Community 12RE: I have a CDT with a number of fields one of which is a number. I wish to displayhttps://community.appian.com/thread/5701?ContentTypeID=1Mon, 02 Dec 2013 14:10:38 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:10bc90bf-697c-45b6-8d92-ec73c5609916grantwFollowing further investigation there was an error in the CDT definition. The field amount was defined as a multi-value field. Once this was corrected the sum() function works.<div style="clear:both;"></div>RE: I have a CDT with a number of fields one of which is a number. I wish to displayhttps://community.appian.com/thread/5685?ContentTypeID=1Fri, 29 Nov 2013 15:47:20 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:d5b703f4-e17b-4fa5-8586-fb00ae103a69shelzleUsing the looping function &quot;reduce&quot; and a custom predicate function that adds the values should do the job.<div style="clear:both;"></div>