LINQ fallback! Consider rewriting your query. Graph: null LINQ Model: from PXResult`1 field in value(PX.Data.SQLTree.SQLQueryable`1[PX.Data.PXResult`1[PX.Api.SYMappingFieldSimple]]) select Convert([field]) at Remotion.Linq.Clauses.StreamedData.StreamedSequenceInfo.ExecuteQueryModel(QueryModel queryModel, IQueryExecutor executor) at Remotion.Linq.QueryProviderBase.System.Linq.IQueryProvider.Execute[TResult](Expression expression) at Remotion.Linq.QueryableBase`1.GetEnumerator() at System.Linq.Buffer`1..ctor(IEnumerable`1 source) at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source) at PX.Api.SYImportProcessSingle.Persist() at PX.Data.PXSave`1.<HandlerInternal>g__Persist|3_2() at PX.Data.PXSave`1.<HandlerInternal>d__3.MoveNext() at PX.Data.PXAction`1.<Press>d__38.MoveNext() at PX.Web.UI.PXBaseDataSource.tryExecutePendingCommand(String viewName, String[] sortcolumns, Boolean[] descendings, Object[] searches, Object[] parameters, PXFilterRow[] filters, DataSourceSelectArguments arguments, Boolean& closeWindowRequired, Int32& adapterStartRow, Int32& adapterTotalRows) at PX.Web.UI.PXBaseDataSource.ExecuteSelect(String viewName, DataSourceSelectArguments arguments, PXDSSelectArguments pxarguments) at PX.Web.UI.PXDataSource.ExecuteSelect(String viewName, DataSourceSelectArguments arguments, PXDSSelectArguments pxarguments) at PX.Web.UI.PXDataSourceView.Select(DataSourceSelectArguments arguments, PXDSSelectArguments swarguments, DataSourceViewSelectCallback callback) at PX.Web.UI.PXFormDataProvider.DataBind() at PX.Web.UI.PXCallbackManager.CollectDataControls(Dictionary`2 controlsDic, List`1 controlsList) at PX.Web.UI.PXCallbackManager.RenderClientData(PXCallbackResultMethod resultMethod, XmlWriter writer) at PX.Web.UI.PXCallbackManager.GetCallbackResultInternal(PXCallbackResultMethod resultMethod) at PX.Web.UI.PXCallbackManager.GetCallbackResult(PXCallbackResultMethod resultMethod) at System.Web.UI.Page.RenderCallback() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequest(HttpContext context) at PX.Web.UI.PXPage.ProcessRequest(HttpContext context) at ASP.pages_sm_sm206036_aspx.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) at System.Web.HttpApplication.PipelineStepManager.ResumeSteps(Exception error) at System.Web.HttpApplication.BeginProcessRequestNotification(HttpContext context, AsyncCallback cb) at System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr rootedObjectsPointer, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(IntPtr rootedObjectsPointer, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) at System.Web.Hosting.UnsafeIISMethods.MgdIndicateCompletion(IntPtr pHandler, RequestNotificationStatus& notificationStatus) at System.Web.Hosting.UnsafeIISMethods.MgdIndicateCompletion(IntPtr pHandler, RequestNotificationStatus& notificationStatus) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr rootedObjectsPointer, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) at System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(IntPtr rootedObjectsPointer, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags)

This is the error I am getting when trying to run the scenario