https://community.appian.com/discussions/f/user-interface/27750/re-custom-data-typeI have a doubt that, If two CDT&#39;s are created for the same table(TCDT without new column and previous cdt with new column) and how can we write to the db that CDT which is new cdt data and moved from existing table and taking primary key as a outputen-USTelligent Community 12https://community.appian.com/thread/108221?ContentTypeID=1Tue, 21 Feb 2023 04:24:18 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:90fcec3c-f485-422b-ae3c-adc53b3e3abaAbhay Dalsaniya<p>You don&#39;t have to create separate&nbsp;CDT just because the new column was added to table. You can update the existing CDT.</p><div style="clear:both;"></div>https://community.appian.com/thread/107945?ContentTypeID=1Tue, 14 Feb 2023 17:27:56 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:a9fa30ec-36c0-4b38-a9df-0af8a4a40b34Chris<p>I think you need to be a little more clear on your situation.&nbsp; You do list &quot;2 CDTs created for the same table&quot;, and then list &quot;moved from existing table&quot;.</p> <p>A CDT is a structure definition, from there you can populate a process variable of this CDT type with data.</p> <p>So you have CDT #1 with fields A, B, C, D.&nbsp; You have some issue with column D so you created CDT #2 with fields A, B, C.&nbsp; Is this correct?&nbsp; Is this pointed at the same table or different?&nbsp; Otherwise you should have no issues saving data with CDT #2 without column D included, it will just not reference column D in the table.</p> <p>As above if you populate CDT 2 the same as CDT 1 minus column D, it will otherwise act the same.</p> <p>I think if you could list the details of your use case one step at a time, that would be helpful.</p><div style="clear:both;"></div>https://community.appian.com/thread/107944?ContentTypeID=1Tue, 14 Feb 2023 16:32:00 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:e3a7a00b-6b10-42d1-a94d-1c34340e8d93sid<p>Any Idea on this?</p><div style="clear:both;"></div>