https://community.appian.com/discussions/f/new-to-appian/21824/no-values-have-been-written-details-could-not-insert-userroledt2804-apnx-1-4208-004Sorry i pose this problem again, this time the situation is a little bit different, i wish to update it. The primary key as ri!userinputsheet.USER_ID, another unique column as ri!userinputsheet.username. I a!writeToDataEntity again, then it got erroren-USTelligent Community 12https://community.appian.com/thread/85586?ContentTypeID=1Wed, 08 Sep 2021 08:09:17 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:41c9341d-c33a-4422-8eaa-dc19af5f87eeimmortalvirgil<p>i figure out already, it is the duplicate entry column for &#39;username&#39;. The actually reason is i could&#39;t find a way match the username with the primary key userid,&nbsp; since this, it can&#39;t update into database</p><div style="clear:both;"></div>https://community.appian.com/thread/85580?ContentTypeID=1Wed, 08 Sep 2021 07:37:17 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:20c1a181-22d5-4f5e-9e73-e7d15568d518Marco Amador<p>[your-environments-url]/suite/logs</p><div style="clear:both;"></div>https://community.appian.com/thread/85552?ContentTypeID=1Wed, 08 Sep 2021 01:01:27 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:dac96417-b1bd-4fa9-ae2f-a0effecf7b4fimmortalvirgil<p>how to check tomcat log? as what you said</p><div style="clear:both;"></div>https://community.appian.com/thread/85529?ContentTypeID=1Tue, 07 Sep 2021 10:54:27 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:d37d4f29-45d6-4ff4-83a8-f57e77bff19aMarco Amador<p>Did you have a look at&nbsp;<strong>tomcat-stdout.log&nbsp;</strong>to see more details about why the Insert failed? It will probably have a more descriptive message there.</p><div style="clear:both;"></div>