Thanks
In the action settings, there is a transfer of the price of the product, taking into account the discount (discount on the product) and the total discount of the process. In this situation, the total discount of the process was transferred as a product discount + UAH 1 was transferred to the total discount of the receipt.
In fact, everything is simple. If there is a process discount, then you just need to transfer it to the check as a check discount. In the check there is a field of the general discount.
Here is the process
https://one-box.shine-bright.com.ua/admin/customorder/order/213743/edit/ , it uses a manual discount and it is applied in the check as a general discount
A coupon is the same general discount for the process, but the logic of transferring the discount to the receipt is completely different for some reason + as a result, an error occurs in the amount of fiscalization. And this is a big problem.