Writing to the Task.Stop field Microsoft Project

Question

I am attempting to take status off of a task by setting the task.stop field to an earlier date using vba. I am getting a "Runtime Error 1101: The argument is not valid."

I have tried the following two lines of code:

Task.Stop = CurrentProj.StatusDate

and

Task.SetField FieldID:=pjTaskStop, Value:=CurrentProj.StatusDate

Current values are:

CurrentProj.StatusDate = 10/31/2013 17:00:00  
Task.Stop = 11/5/2013 17:00:00 

both are of Variant/Date DataType

I could not find and use of the Stop field in any forums. Thanks for any help you can provide.

Answer 1

The "Split in Progress Tasks" option must be selected or the Stop field will be read only. File>Options>Schedule>Scheduling options for this project>Split in progress tasks. Checking that box solved the problem.