Position in the payment plan that is never fulfilled

Hello everyone,

unfortunately, I couldn't find anything in the forum that helps me.

The situation is as follows:
I have signed a fixed-price contract (contract for work according to the Building Code) for a turnkey house.

Of course, I was given a construction description and a payment plan with the contract, which I signed.
The payment plan is divided into many partial payments, about 30-40 items. Payment is always made only after the service is rendered.

In this payment plan, there is the item "Erstellung der Betondecke OG" with about €11,000.
However, my house was never planned to have a concrete ceiling on the upper floor from the beginning. This means this service will never be performed.

Am I correct in understanding that he cannot charge me this amount since no service was provided? Or do I have to pay this item because it belongs to the fixed lump sum price?

Regards

Or do I have to pay for the item because it is included in the fixed lump sum price?

You have to pay the total amount. When, is another question. Otherwise, it would not be a fixed lump sum price. Or is there anything in the contract about minimum quantities or similar?

You have to pay the total amount. When is another question. Otherwise, it wouldn’t be a fixed lump sum price. Or does the contract say something about minimum quantities or similar?

No, it doesn’t say anything about that, but the construction description states that concrete ceilings on the upper floor are subject to an extra charge... since I don’t have any, he actually can’t charge me anything. Fixed lump sum price or not?

I would ask? So, at the house construction company?

Well, I suppose that will simply be replaced with 'Erstellung der Holzbalkendecke OG' and that's it.

Well, I guess it will simply be replaced with 'Creation of the wooden beam ceiling upper floor' and that's it.

I didn't either, it's completely open :D