Problem with AssignedPressureDrop property

Hi,

I have problem with set AssignedPressureDrop property.
This property return double value.

public double AssignedPressureDrop { get; set; }


My code work only when I set integer value like 10:
item.MEPModel.ConnectorManager.Lookup(1).AssignedPressureDrop=10;

but i can't set double value:
item.MEPModel.ConnectorManager.Lookup(1).AssignedPressureDrop=10.123;

Any ideas how to make it work?