Hi,

The issue with the incorrect margin calculation and wrong “Excluding Taxes” total on sales orders in Odoo is likely caused by either a customization error, a misconfigured field dependency, or an incorrect computation formula in your sale order line model or view. When the margin field displays -13.85 DT instead of 2.15 DT, it usually indicates that Odoo is using the wrong base (for example, subtracting cost from untaxed subtotal before taxes are correctly computed, or mixing up signed values).

For the “Hors taxes” (excluding tax) display issue, this often happens when the XML view or widget is showing price_unit instead of price_subtotal. The price_unit field always shows the per-unit price (4.00 DT), while price_subtotal holds the correct total for the line (20.00 DT). Checking and correcting the view to use t-field="line.price_subtotal" will fix the display problem.

To resolve the margin issue, review the compute method for the margin field (usually _compute_margin) or any overridden logic in custom modules. Ensure it’s calculated as margin = price_subtotal - purchase_price * product_uom_qty, and confirm both purchase_price and price_subtotal are correctly stored before computing. After correcting and updating the view and compute logic, your sales line should display the proper untaxed total and accurate profit margin.

Hope it helps