Updating Quote Markup/Percent using code

I have been trying to change the percentages using code in quote entry on the worksheet.
Every time I save they go back to zero.
I tried by setting it in the dataview and updating.

I tried setting the value of the control and updating.

I even tried to mimic typing by setting focus to the control, using Sendkeys to send the value and then also a Tab then updating.

I tried using ValidateProfit Method and get an error.

Anybody successfully updating these fields using code as opposed to manually typing in always?