first commit

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Editors
+*.swp
+*~
+.idea/
+.vscode/

README.md

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+# Stock Fix Unpicked Backorder
+
+## Overview
+This module patches an issue in Odoo 19 where validating a partial stock picking and choosing "No Backorder" causes Odoo to explicitly cancel any stock move lines that have not been manually marked as `picked`. This cancellation results in their quantity being zeroed out, even if the line's quantity perfectly matched its demand.
+
+## Technical Details
+Odoo 19's `stock.picking` validation skips automatically marking lines as `picked = True` if *any* other line in the transfer was manually processed/picked. When `cancel_backorder=True` is provided (via the "No Backorder" wizard), the `_action_done` method of `stock.move` cancels moves that are not picked or have <= 0 quantity.
+
+This module overrides `_pre_action_done_hook` on `stock.picking` to ensure that any move with a `quantity > 0` is automatically marked as `picked = True` right before the validation logic runs.
+
+## Usage
+Simply install the module. The fix is applied automatically during the backorder validation flow.

__init__.py

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+from . import models

__manifest__.py

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+{
+    'name': 'Stock Fix Unpicked Backorder',
+    'version': '19.0.1.0.0',
+    'category': 'Inventory/Inventory',
+    'summary': 'Fixes Odoo 19 issue where lines with quantity are zeroed out on No Backorder',
+    'depends': ['stock'],
+    'data': [],
+    'installable': True,
+    'auto_install': False,
+    'license': 'LGPL-3',
+}

models/__init__.py

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+from . import stock_picking

models/stock_picking.py

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+from odoo import models
+
+class StockPicking(models.Model):
+    _inherit = 'stock.picking'
+
+    def _pre_action_done_hook(self):
+        # Odoo 17 skips auto-setting `picked = True` if _any_ line was manually picked.
+        # This causes unpicked lines with `quantity > 0` to be cancelled 
+        # when the user selects "No Backorder", zeroing out their quantity.
+        # We enforce that any line with quantity > 0 is treated as picked.
+        for picking in self:
+            for move in picking.move_ids:
+                if move.quantity > 0 and not move.picked:
+                    move.picked = True
+        return super()._pre_action_done_hook()