ISH-PA Manual discount

Good evening you,

I would be very grateful if you could help me.
Her question is about ISH-PA
We have a business requirement to give a manual discount for specific service in case.
We have added this feature on the payment distribution screen.


We have created a new condition type - ZIMA for manual discount
The generated condition table- A928

We also need to create entries in the NVVQ table
We are having difficulty saving data to the NVVQ table and have not been able to find any information online.

Do you know correct way to use the NVVQ table for give discount for specific service and IP?

Or if you have another idea how to implement this request.

Thanks in advance,
Chedvi.