SQL Table Editor Unable to Save Data

OS Version 7.4.2
I have a SQL Table Editor in a dashboard.  Three columns: Date, Amount, Descr.  The user can edit Amount and Descr. No Inserts, no deletes.
The table loads with a bunch of dates.  The user fills in amounts in records where needed. The descr and amount columns both accept nulls.
With the "Save Data Server Task" set to "No Task", when an amount is added to one record (or several), and save is clicked, the following error occurs:

With the "Save Data Server Task" set to "Execute Dashboard Extender Business Rule", I specify a Rule and get the same "Wrong Number of database rows" error.

If I use the SQL Table Editor code supplied by OneStream in the Rule, the error in the log is:

I'm trying another version of this which omits the use of the Using block. Same "Wrong Number of database rows" error and the log just shows "Unknown Error"

Public Class MainClass
  Public Function Main(ByVal si As SessionInfo, ByVal globals As BRGlobals, ByVal api As Object, ByVal args As DashboardExtenderArgs) As Object
    Dim saveDataTaskResult = Nothing
    Try
      Select Case args.FunctionType          
        Case Is = DashboardExtenderFunctionType.SqlTableEditorSaveData
          If args.FunctionName.XFEqualsIgnoreCase("SaveInvoiceStagedAmounts") Then
            SaveRecords(si, args)            
            saveDataTaskResult = New XFSqlTableEditorSaveDataTaskResult()
            saveDataTaskResult.IsOK = True
            saveDataTaskResult.ShowMessageBox = False
            saveDataTaskResult.Message = ""
            saveDataTaskResult.CancelDefaultSave = True               
          End If
      End Select
    Catch ex As Exception
      Throw ErrorHandler.LogWrite(si, New XFException(si, ex))
    End Try
    Return saveDataTaskResult
  End Function
  
  Private Sub SaveRecords(si As SessionInfo, args As DashboardExtenderArgs)
    Dim dbConn As DbConnInfo = Nothing
    Try
         dbConn = BRApi.Database.CreateDbConnInfo(si, args.SqlTableEditorSaveDataTaskInfo.SqlTableEditorDefinition.DbLocation, args.SqlTableEditorSaveDataTaskInfo.SqlTableEditorDefinition.ExternalDBConnName)
        dbConn.BeginTrans()
        BRApi.Database.SaveDataTableRows(dbConn, args.SqlTableEditorSaveDataTaskInfo.SqlTableEditorDefinition.TableName, args.SqlTableEditorSaveDataTaskInfo.Columns, args.SqlTableEditorSaveDataTaskInfo.HasPrimaryKeyColumns, args.SqlTableEditorSaveDataTaskInfo.EditedDataRows, True, False, True)
        dbConn.CommitTrans()
        'prevent the UI from trying to save what we already saved, while allowing the ui to refresh to show the changes by 
        'leaving cancelDefaultSave as false
        args.SqlTableEditorSaveDataTaskInfo.EditedDataRows.RemoveAll(Function(x) x.InsertUpdateOrDelete = DbInsUpdateDelType.Insert)
        args.SqlTableEditorSaveDataTaskInfo.EditedDataRows.RemoveAll(Function(x) x.InsertUpdateOrDelete = DbInsUpdateDelType.Update)
    Catch ex As Exception
        dbConn.RollbackTrans()
        Throw New XFException($"{Environment.NewLine}{Me.GetType().ToString()}.{System.Reflection.MethodBase.GetCurrentMethod().Name}(): {ex.Message}", ex)
    Finally
        dbConn.Close()
    End Try
  End Sub
End Class