Revit Stair Treads - Minimum Widths

When editing Revit component stairs, have you ever encountered an error message where it tells you that the actual tread width is less than the minimum allowed tread width, when in fact the two values are identical?

Usually it allows you to set tread widths the same as the minimum allowed value, but occasionally not.  I suspect this occurs when you mess with the minimum allowed value (a Type property of the whole stair) - perhaps when you increase the minimum to match an actual value that is already modelled.

My solution is to change the actual width value to be say 1mm more than the minimum, then change it back again so they are the same - error message gone.