We might do entity work simply as a technique to transform the client's responses. As such it is a type of semantic processing. We find that part of the person's inner reality is that there is some stuff there which responds as entities, we go along with it, and we change it. For the purpose of getting subjective results it really doesn't matter how "correct" it is or who we are really talking with. It doesn't matter at all if it is only done as a way of changing the state of this individual. It might simply be taken as a suitable metaphor.
But if we do any kind of entity processing in order to change external phenomena, that is a different matter. The reason I emphasize it is because it might at first glance appear to work exactly the same way. You contact some suitable entities who will talk with you and you work with them and they appear to change.
The difference is in what kind of rapport you have.
For a subjective change for one person it is perfectly fine to have a rapport in terms of mental or visual feedback. That is, you see the entity, you talk with it, it changes somehow based on what you talk about. Preferably the person feels different afterwards.
Just because we sit down in session and we talk with "Mr. Jones" down the street and he promises to be a nice person does NOT necessarily mean anything in the physical universe. Or rather, we can't be sure how much it will mean just based on that happening. Even though the "Mr. Jones" we talk with in the session changes into a loving and good natured person does not mean that the Mr. Jones we meet on the street will appear much different. Maybe he will, though, don't discount the power of what we can do.
If we are looking for physical results we need physical feedback. If you want Mr. Jones to change, you need to process towards Mr. Jones changing. That is, you keep going until he walks up to you on the street and acts like a different person. A change in the objective Mr. Jones is likely to take longer than it would take to change the subjective "Mr. Jones". Maybe much longer. Maybe it isn't likely at all, maybe he doesn't WANT to change.
If you want to change the weather and you are planning to talk with some kind of weather gods or something, that is fine. But you would need to get into rapport with them to the degree that the weather changes. You might subjectively interact with somebody who claims to be in charge of the weather and they promise sunshine tomorrow and it then doesn't happen. That doesn't mean nothing happened, it just means one didn't have a high enough degree of rapport with the right entities, or one just didn't continue long enough.
Any process can be measured against either subjective or objective results. Don't mix them up. Which one you use depends on what kind of results you want. Transformational processing is mostly geared towards subjective results, and only more long-term towards objective results. If you want specific objective results you need to use those as the measuring stick rather than whether the person feels good or looks happy.