- Fix _compute_price_rule: use 'quantity' positional parameter instead of 'qty'
- Fix stock_move: use 'quantity' instead of 'quantity_done' (Odoo 18 change)
- Fix _get_price return value: extract 'value' key directly from dict
- Add last_purchase_price related field in product.product for pricelist base
- Remove company_dependent+required conflict (use only company_dependent)
- Calculate list_price without taxes (taxes applied automatically on sales)
- Add comprehensive debug logging for price calculations
- Add action_update_list_price to compute theoretical price before updating
- Add 3 new tests for purchase price validation and zero price handling
- Fix _compute_price_rule to handle multiple tax amounts correctly
- Update manifest version to 18.0.1.0.0
- Update view inheritance to use Odoo 18 <block>/<setting> structure
- Update pricelist models for Odoo 18 API changes (qty parameter)
- Remove required=True from company_dependent field
- Add comprehensive test suite (33 tests)
- Tests cover: pricelist calculations, stock moves, product templates, and config settings
