A report (khabar) is an utterance that conveys a claim capable of being assessed as true or false. A proposition (qaḍiyyah) is the complete predicative content studied by logicians. These categories overlap, while highlighting reporting and logical structure respectively.
“This door is open” asserts a condition and is open to truth assessment. “Open the door” is a command, and “Is the door open?” is a question; neither functions as an assertion in the same way.
The first task is therefore to determine whether an expression asserts a complete proposition. Only then is it appropriate to ask whether the asserted relationship corresponds to the actual condition of the subject.