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Do the interior walls need to be plastered first before screeding the underfloor heating?

I'm renovating an old house (built around 1900) and would like to install underfloor heating on the first floor. The old floor has already been removed, a new slab has been poured, the electrics and pipes have already been laid, and the next step will be underfloor heating.

Right now we can't start plastering right away because there are various reasons for delays. That's why my craftsmen are debating whether or not we can lay the screed directly on top of the underfloor heating, because the walls need to be plastered first. Now I have to decide if the interior walls should be plastered first, but I'm not sure. The screed will be adjacent to an old brick wall, which is also not perfectly level. The house is on a basement, so everything feels dry from below. The floor will be tiled afterwards. I understand there will be a mess later when we clean it up. Then I would try to cover the floor. But, in your opinion, is there anything seriously wrong with laying the screed directly to the "exposed" wall and removing it later?

• floor
• underfloor heating