Updating fields with a Script Expressions

I've found this line of code invaluable when Quick Actions and Business Rules just won't work for you

currentBusinessObject.GetField("FieldName").SetValue(new Fusion.FusionValue(VariableName));

It writes the variable VariableName to the field FieldName in the current business object. You can also replace VariableName variable with a value of any type (obviously in the format "String")