https://community.appian.com/discussions/f/user-interface/6344/i-have-a-cdt-which-have-two-fields-field1-field2-150-field1-230I have a cdt which have two fields [field1=,field2=150],[field1=230,field2=],[field1=23,field2=] Either field1 or field2 will have a value in each record. I need to Check which field is not empty and display in the single column of the grid. Please helpen-USTelligent Community 12https://community.appian.com/thread/24786?ContentTypeID=1Tue, 17 Nov 2015 22:24:25 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:7add482c-1199-48a4-93e4-1894206c2f43Shyam BommakantiIf you have Appian common objects app deployed, there&#39;s a rule you can use<br />APN_replaceNull (Returns nullableValue only if it is not null. Else return replacementValue.)<br /><br />Use apply on the grid it will only display and not update CDT.<div style="clear:both;"></div>https://community.appian.com/thread/24758?ContentTypeID=1Tue, 17 Nov 2015 12:32:25 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:9dccabf8-1021-4daa-9b19-e01a634247a6harshavmay be you can try like this, write a expression like if(isnull(field1),field2,field1)<br />Then you do this function in apply like apply(fn!rulesaidabove,merge(field1,field2))<br />May be you need to do a little work around if the merge is not working, Hope this would help!!! :)<br /><div style="clear:both;"></div>https://community.appian.com/thread/24747?ContentTypeID=1Tue, 17 Nov 2015 11:18:08 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:c3026c38-e14a-49e6-83ee-494621944436srinivasulupHere you are not updating the original CDT, store the result in the temporary variable and map to the grid<div style="clear:both;"></div>https://community.appian.com/thread/24746?ContentTypeID=1Tue, 17 Nov 2015 11:12:06 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:296d4338-2cde-4a5d-8f72-349676e13be4Dharsanai dont want to update the cdt.. only while displaying in grid i need to apply<br /><div style="clear:both;"></div>https://community.appian.com/thread/24745?ContentTypeID=1Tue, 17 Nov 2015 11:11:53 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:313417fa-39c6-49dd-91e6-fe4f01133b3esrinivasulupfn!apply(rule!customRule(_), ri!array)<br /><br />customRule:<br />fn!if(<br /> fn!isnull(<br /> ri!array.field1<br /> ),<br /> ri!array.field2,<br /> ri!array.field1<br />)<br /><br />This gives you an array and map the same to the grid field.<div style="clear:both;"></div>https://community.appian.com/thread/24744?ContentTypeID=1Tue, 17 Nov 2015 11:10:00 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:51523d5c-add6-44d3-ab7f-37dd842497c8Stefan HelzleWhy not create an expression that checks which value is available and then shows that. You can apply this to your list of CDTs.<div style="clear:both;"></div>