I issued bill and then if I try issue next one → i have sum and pay on from previous. First bill: <img width="521" height="1107" alt="Image" src="https://github.com/user-attachments/assets/7d81c2b3-71e7-4551-8a9b-be59b8c9d9c4" /> New issue process: <img width="488" height="1128" alt="Image" src="https://github.com/user-attachments/assets/b46595b6-4787-4ee0-8ce1-903945467686" />