I am not sure what you are asking but will give it a shot.
Only a step has Step.Result.ReportText and Step.Result.Status properties. Therefore you cannot set these properties for a sequence callback. For certain callbacks that are called by a sequence call step, you can set Step.Result.ReportText and Step.Result.Status of the Sequence Call step that called the callback. To do this you can set Runstate.Caller.Step.Result.ReportText and Runstate.Caller.Step.Result.Status within the callback.
If this does not help you then you must provide information as to which callback you are using and for what step you want to set the Step.Result.ReportText and Step.Result.Status properties