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  Using D365 Flow if you want to insert or update a record then you may get this error. This error was raised because in your entity this is a lookup field and you need to set the value with the lookup entity plural name. Like

 If you want to add a search field into the lookup view you will not able to add the add option.  In this case, you need to add the field into Quick Find View it will take the impact of another view For my case, I was using Product Lookup view into lookup view 

 You are getting this error into your plugin  Unable to cast object of type 'System.Guid' to type 'Microsoft.Xrm.Sdk.EntityReference' Your crud operation Entity field has a Lookup field relationship and it is expecting EntityReference. EntityReference conactEntityReference = new EntityReference { Id = newContactEntity.Id, LogicalName = Contact.EntityLogicalName }; localContext.OrganizationService.Update(new Entity(proevt_eventregistration.EntityLogicalName, inputEventseriesEntity.Id) { ["proevt_contactid"] = conactEntityReference });  

 If we use an alias in our fetchxml query it will not retrieve the alias attribute like the default query. String inputstdssAttendeeFetchXML = $@"<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false'> <entity name='std_stdssattendee' > <attribute name='std_attendeeroleid' /> <filter> <condition attribute='std_stdstdssid' operator='eq' value='{ inputstdss.GetAttributeValue<Guid>("std_stdstdssid")}' /> <condition attribute='statecode' operator='eq' value='0' /> <condition attribute='std_attendeeroleid' operator='not-null' /> ...

 If we want to call another plugin or action from plugin we can use this approach. // Call std Copy action into plugin OrganizationRequest request = new OrganizationRequest("std_Copystd"); request["Target"] = stdEntityReference; OrganizationResponse response = localContext.OrganizationService.Execute(request); string clonestdresultresult = (string)response.Results["Result"]; string ClonestdId = (string)response.Results["CloneId"];

 we can update any entity record without retrieving  String stdattendeeFetchXML = $@"<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false'> <entity name='std_stdattendee' > <attribute name='std_contactid' /> <attribute name='std_attendeecategory' /> <attribute name='std_attendeeroleid' /> <attribute name='std_name' /> <filter type='and' > <condition attribute='std_stdid' operator='eq' value='{ClonestdId}' /> <condition attribute='statecode' operator='eq' value='0' /> ...

 If you want to get all selected values of a subgrid you can try with this sample. var gridContext = formContext.getControl("AttendeesSubgrid"); var allSelectedRows = gridContext.getGrid().getSelectedRows(); var attendeeList = []; allSelectedRows.forEach(GetSelectedRecord); function GetSelectedRecord(item) { var rowData = item._entityId; var attendiee = rowData.guid; attendeeList.push(attendiee); }

 In my case, I need to add custom filtering when I select a lookup it will populate another lookup. when the user will click on the search icon it will show only filter data.  I was following:  https://docs.microsoft.com/en-us/powerapps/developer/model-driven-apps/clientapi/reference/controls/addpresearch sample code: var demoLAB = demoLAB || {}; var classId; demoLAB.Stuedent = { Form: { Load: function (executionContext) { 'use strict'; var formContext = executionContext.getFormContext(); this.attachEvents(executionContext); }, attachEvents: function (executionContext) { 'use strict'; var formContext = executionContext.getFormContext(); var form = demoLAB.Stuedent.Form; // Student Change Event formContext.getAttribute("demo_studentId").addOnChange(form.studentOnChange); }, studentOnChange: function (executionContext) { ...

 You can lock the form field using javascript. if (formContext.getControl("acconutid").getAttribute()!= null) formContext.getControl("acconutid").setDisabled(true);

 Generate the xml query using xrmtoolbox and try with this code sample. String eventsessionFetchXML = $@"<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false'> <entity name='baseevt_eventsession' > <attribute name='baseevt_eventid' /> <attribute name='baseevt_sessionenddatetime' /> <attribute name='baseevt_sessionstartdatetime' /> <attribute name='baseevt_name' /> <attribute name='baseevt_description' /> <filter> <condition attribute='baseevt_eventid' operator='eq' value='{inputEntity.Id.ToString()}' /> </filter> </entity> </fetch>"; var eventSessionresult =...

  If you want to call plugin from ribbon button click event with custom action, you can use this script. // Ribbon button click event call custom action executeCloneEvent: function (formContext, eventId) { var eventId = formContext.data.entity.getId(); var entityrecordId = eventId.substr(1, eventId.length - 2); var request = { entity: { entityType: "account", id: entityrecordId}, getMetadata: function () { return { boundParameter: "entity", parameterTypes: { "entity": { "typeName": "account", "structuralProperty": 5 }, }, operationType: 0, operationName: "acct_CloneEvent" }; } }; // Calling Plugin Xrm.WebApi.online.execute(request).then(function (result) { ...