Hi Mikhail,
I don't understand how you can have two conditions on the same database field - one range 'and' a NULL too.
How will this evaluate because the condition will never be true. Should it be 'OR'?
How about this formula in Record Filter:
{Delivery Date} IN [date_to TO date_from]
OR {Delivery Date} = cdate(0,0,0)
-Abhilash