You are absolutely right, of course. What I meant is, as an officer, your assessment whether the order you receive is lawful or not is based on a personal judgm

You are absolutely right, of course. What I meant is, as an officer, your assessment whether the order you receive is lawful or not is based on a personal judgment, there is no lookup table you can go and check the legality of the order. In most cases, not obeying an order will result in investigations later on, and the legality will be established by various legal experts.