We had the bureaucrats here, and their point was that as long as it was paid for, it was fine. But you have situations, for example, with bigger contractors installing windows. You may order the windows, but not necessarily have them installed. What do you do in that case? As somebody who would have given the contract, I don't necessarily go to the shop factory and see if the windows were actually built. So how do we do that?
One of the recommendations was to have the invoice separated to show that the building portion but not the installation portion was completed by January 31. I'm not sure if that's logistically possible. I'm not sure in your case how that could be done.