In standard Odoo POS, a cashier can overpay using a Bank method (card, transfer, etc.), which may create change and sometimes leads to inconsistent payment lines (negative or 0.00 lines) that can cause accounting imbalances.

This module enforces a strict and safe rule: Bank methods can never generate change. If change is needed, it must originate only from Cash.

• ✅ No change on Bank - Bank methods are capped to the remaining amount
• ✅ Change only from Cash - Cash can exceed total and generate change
• ✅ Dangerous mix blocked - If Cash already overpays, adding Bank is blocked
• ✅ No negatives (sales) - Negative amounts are blocked in normal sales
• ✅ No 0.00 lines - It is automatically removed upon validation
• ✅ Consolidation - Reuses existing payment line instead of duplicates
• ✅ Central validator - One invariant enforcer runs after each payment event
• ✅ Final hard-check - Prevents validation if invariants are violated
• ✅ Refunds excluded - Rules apply only when total > 0
• ✅ No core overrides - Uses OWL patches and standard extension mechanisms

• ✔ Community
• ✔
  Enterprise
  (On-premises)
• ✔ Odoo.sh
• ✘ Online