Odoo POS Real-Time Balance Fix

I'm seeking an Odoo expert to resolve an issue with my Odoo Point of Sale system. The "Amount Due" balance on customer invoices/receipts does not update in real time. It only refreshes after I close and reopen the POS session.

Requirements:
- Fix the real-time balance update issue
- Ensure the solution works for all payment types

Ideal Skills & Experience:
- Expertise in Odoo, especially POS functionality
- Experience troubleshooting and fixing Odoo issues
- Familiarity with custom modules and third-party applications in Odoo

Please provide a brief overview of your experience with similar issues.