I got it fixed - thanks for trying to help. And yes, the problem was that my code was trying to access one of the BO's properties and I stupidly missed it

Actually, to be more precise, this is code that was generated by the business object mapper...

This is not my code - it is framework code. I do not have code anywhere that accesses noPlanParticipant - it is just sitting on the form.

You should test for BO.Count > 0 before using any of its properties.

Trinity.BusinessObjects.boPlanParticipant.get_plan_fk() -> this is the code failing, enclose it in the above test and you should be fine.

The BO that is causing this error is for an allocation table that I am manipulating in code. All I did was drop it on the form - I did not bind it to any controls. Now I can no longer bring the form up because of this error. Any ideas?

BusinessLayerException
  The CurrentRow for table '[dbo].[planparticipant]' could not be evaluated because the CurrentRowIndex is out of range.  Business object record count: 0.  CurrentRowIndex: -1.

Source     : MicroFour StrataFrame Business

Stack Trace:
   at MicroFour.StrataFrame.Business.BusinessLayer.get_CurrentRow()
   at Trinity.BusinessObjects.boPlanParticipant.get_plan_fk() in F:\Trinity_new\Trinity\BusinessObjects\boPlanParticipant.Designer.cs:line 320
   at Trinity.Forms.Participants.boParticipants_Navigated(NavigatedEventArgs e) in F:\Trinity_new\Trinity\Forms\Participants.cs:line 83
   at MicroFour.StrataFrame.Business.BusinessLayer.NavigatedEventHandler.Invoke(NavigatedEventArgs e)
   at MicroFour.StrataFrame.Business.BusinessLayer.raise_Navigated(NavigatedEventArgs e)
   at MicroFour.StrataFrame.Business.BusinessLayer.OnNavigated(NavigatedEventArgs e)
   at MicroFour.StrataFrame.Business.BusinessLayer.ForceNavigatedAndBoundRefresh(Boolean dataTableRefilled)
   at MicroFour.StrataFrame.Business.BusinessLayer.OnCurrentDataTableRefilled()
   at MicroFour.StrataFrame.Business.BusinessLayer.ChangeCurrentDataTable(DataTable NewTable, Boolean AcceptChanges, Boolean IsSharedTable)
   at MicroFour.StrataFrame.Business.BusinessLayer.ChangeCurrentDataTable(DataTable NewTable, Boolean AcceptChanges)
   at MicroFour.StrataFrame.Business.BusinessLayer.ChangeCurrentDataTable(DataTable NewTable)
   at MicroFour.StrataFrame.Business.BusinessLayer.FillDataTable(DbCommand CommandToExecute)
   at Trinity.BusinessObjects.boParticipants.GetParticipant(Int32 tnParticpant_pk) in F:\Trinity_new\Trinity\BusinessObjects\boParticipants.cs:line 63
   at Trinity.Forms.Participants.GetCurrentParticipant(Int32 tnParticipant_pk, Boolean tlPutInEditMode) in F:\Trinity_new\Trinity\Forms\Participants.cs:line 48
   at Trinity.Forms.Plans.EditParticipant(Boolean tlPutInEditMode) in F:\Trinity_new\Trinity\Forms\Plans.cs:line 252
   at Trinity.Forms.Plans.grdParticipants_DoubleClick(Object sender, EventArgs e) in F:\Trinity_new\Trinity\Forms\Plans.cs:line 302
   at System.Windows.Forms.Control.OnDoubleClick(EventArgs e)
   at System.Windows.Forms.DataGridView.OnDoubleClick(EventArgs e)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.DataGridView.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativewindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativewindow.WndProc(Message& m)
   at System.Windows.Forms.Nativewindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)