I getting the error below when I attempt to save from my form. The linkage field to my two new child BOs is the parent key and not the autoincrementing keys of the Child tables the BO is associated with.

ParentRelationship is the Parent PK to FK in Child.  

BusinessLayerException
 An error occurred while saving an the data to the server.
DataLayerSavingException
 Cannot create INSERT command because a business object with PrimaryKeyIsAutoIncremented = True must have exactly 1 primary key field.
Exception
 Cannot create INSERT command because a business object with PrimaryKeyIsAutoIncremented = True must have exactly 1 primary key field.

Source     : MicroFour StrataFrame Business

Stack Trace:
   at MicroFour.StrataFrame.Data.DataLayer.BuildInsertInfo(DataTable UpdatingTable, Boolean Transactional, String TransactionKey)
   at MicroFour.StrataFrame.Data.DataLayer.UpdateDataTableThread(Object ThreadParams)
   at MicroFour.StrataFrame.Data.DataLayer.SaveByForm(DataTable TableToSave, Boolean Transactional, String TransactionKey)
   at MicroFour.StrataFrame.Business.BusinessLayer.SaveByForm(Boolean Transactional, String TransactionKey)
   at MicroFour.StrataFrame.UI.Windows.Forms.BaseForm.Save(Boolean Transactional, String TransactionKey)
   at MicroFour.StrataFrame.UI.Windows.Forms.BaseForm.Save()
   at MicroFour.StrataFrame.UI.Windows.Forms.DevEx.MaintenanceFormToolbar.cmdSave_ItemClick(Object sender, ItemClickEventArgs e)
   at DevExpress.XtraBars.BarItem.OnClick(BarItemLink link)
   at DevExpress.XtraBars.BarBaseButtonItem.OnClick(BarItemLink link)
   at DevExpress.XtraBars.BarItemLink.OnLinkClick()
   at DevExpress.XtraBars.BarItemLink.OnLinkAction(BarLinkAction action, Object actionArgs)
   at DevExpress.XtraBars.BarButtonItemLink.OnLinkAction(BarLinkAction action, Object actionArgs)
   at DevExpress.XtraBars.BarItemLink.OnLinkActionCore(BarLinkAction action, Object actionArgs)
   at DevExpress.XtraBars.ViewInfo.BarSelectionInfo.ClickLink(BarItemLink link)
   at DevExpress.XtraBars.ViewInfo.BarSelectionInfo.UnPressLink(BarItemLink link)
   at DevExpress.XtraBars.Controls.CustomLinksControl.OnMouseUp(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at DevExpress.XtraBars.Controls.DockedBarControl.WndProc(Message& msg)
   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)

Here they are. Thanks!

What's strange is that all the children have auto-incrementing primary keys. But I notice the key symbol on case_sid in the drivers table. I have no idea how that got marked as a key.

I can't tell which picture you're referring to because the images are so small, but it looks like the top picture has 2 primary key fields.  Most likely your definition of the structure for the table, whether in the DDT or in SQL Server, contains both as part of the primary key for the table.  So, that is what is cauing your error... you can only have 1 primary key field on the business object if the primary key is configured to auto-increment. 

If you cannot determine what is causing both of the fields to be recognized as part of the primary key, you can customize the business object in the BOMapper, by editing it's properties, and override the primary key definition by selecting only the one field that should be the auto-incremented pk.

I'll try that