feat: Automatically adjust negative cash closing differences to prevent loss journal entries and increment module version.

.gitignore

@@ -0,0 +1,71 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.pot
+*.po
+
+# Odoo specific
+*.log
+filestore/
+session/
+.odoo/
+
+# System
+.DS_Store
+Thumbs.db
+
+# Editors
+.vscode/
+.idea/
+*.swp

README.md

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+# POS Cash Opening Adjustment
+
+**Version:** 17.0.1.1.0  
+**Author:** Suherdy Yacob  
+**Category:** Point of Sale  
+**License:** LGPL-3
+
+## Summary
+Prevent opening cash journal entries and exclude opening float from closing totals while keeping reconciliation data.
+
+## Features
+- **Opening Cash Adjustment:** Modifies how opening cash is handled to prevent unwanted journal entries.
+- **Closing Totals:** Excludes opening float from closing totals calculation.
+- **Zero-Amount Payment Cleanup:** Automatically removes `pos.payment` lines with `0.00` amount during session verification. This prevents the creation of "Difference at closing PoS session" journal items triggered by empty payments (e.g. from 100% discount or external payment edge cases).
+- **Negative Cash Closing Adjustment:** Automatically overrides the cashier's input to match the expected closing balance if a negative difference is detected, logging the action in the chatter and preventing a loss journal entry.
+
+## Technical Details
+### Zero-Amount Payment Fix
+The module overrides `_validate_session` in `pos.session`. Before the standard validation process begins, it iterates through all orders in the session and unlinks any payment lines where the amount is considered zero by the session's currency.

__manifest__.py

@@ -1,7 +1,7 @@
 {
     "name": "POS Cash Opening Adjustment",
     "summary": "Prevent opening cash journal entries and exclude opening float from closing totals while keeping reconciliation data.",
-    "version": "17.0.1.0.0",
+    "version": "17.0.1.1.0",
     "category": "Point of Sale",
     "author": "Suherdy Yacob",
     "depends": ["point_of_sale"],

models/pos_session.py

@@ -133,3 +133,23 @@ class PosSession(models.Model):
                 "amount": expected_total,
             })
         return data
+
+    def _validate_session(self, balancing_account=False, amount_to_balance=0, bank_payment_method_diffs=None):
+        for session in self:
+            if session.config_id.cash_control:
+                difference = session.cash_register_balance_end_real - session.cash_register_balance_end
+                if session.currency_id.compare_amounts(difference, 0.0) < 0:
+                    session.message_post(body="Auto-adjustment: Cashier input %s overridden to expected %s to suppress negative difference of %s." % (
+                        session.currency_id.format(session.cash_register_balance_end_real),
+                        session.currency_id.format(session.cash_register_balance_end),
+                        session.currency_id.format(difference)
+                    ))
+                    session.write({'cash_register_balance_end_real': session.cash_register_balance_end})
+                    if amount_to_balance:
+                        amount_to_balance -= difference
+
+            for order in session.order_ids:
+                for payment in order.payment_ids:
+                    if session.currency_id.is_zero(payment.amount):
+                        payment.unlink()
+        return super(PosSession, self)._validate_session(balancing_account, amount_to_balance, bank_payment_method_diffs)