diff --git a/website_sale_aplicoop/controllers/website_sale.py b/website_sale_aplicoop/controllers/website_sale.py
index 0510e30..3568580 100644
--- a/website_sale_aplicoop/controllers/website_sale.py
+++ b/website_sale_aplicoop/controllers/website_sale.py
@@ -416,16 +416,44 @@ class AplicoopWebsiteSale(WebsiteSale):
 
         # Safety: Get UoM category name (use sudo for read-only display to avoid ACL issues)
         uom_category_name = ""
-        quantity_step = 1  # Default step for integer quantities
+        quantity_step = 1  # Default step for integer quantities (Units)
+
         if product.uom_id:
             uom = product.uom_id.sudo()
             if uom.category_id:
                 uom_category_name = uom.category_id.sudo().name or ""
-                # Use 0.1 step for weight-based products (kg, g, etc.)
-                # This allows fractional quantities for bulk products
-                category_name_lower = uom_category_name.lower()
-                if "weight" in category_name_lower or "kg" in category_name_lower:
-                    quantity_step = 0.1
+
+                # Use XML IDs to detect fractional UoM categories (multilingual robust)
+                # This works regardless of translation/language
+                try:
+                    # Get external ID for the UoM category
+                    ir_model_data = request.env["ir.model.data"].sudo()
+                    external_id = ir_model_data.search(
+                        [
+                            ("model", "=", "uom.category"),
+                            ("res_id", "=", uom.category_id.id),
+                        ],
+                        limit=1,
+                    )
+
+                    if external_id:
+                        # Standard Odoo UoM categories requiring fractional step
+                        fractional_categories = [
+                            "uom.product_uom_categ_kgm",  # Weight (kg, g, ton, etc.)
+                            "uom.product_uom_categ_vol",  # Volume (L, m³, etc.)
+                            "uom.uom_categ_length",  # Length/Distance (m, km, etc.)
+                            "uom.uom_categ_surface",  # Surface (m², ha, etc.)
+                        ]
+                        full_xmlid = f"{external_id.module}.{external_id.name}"
+                        if full_xmlid in fractional_categories:
+                            quantity_step = 0.1
+                except Exception as e:
+                    # Fallback to integer step on error
+                    _logger.warning(
+                        "_prepare_product_display_info: Error detecting UoM category XML ID for product %s: %s",
+                        product.id,
+                        str(e),
+                    )
 
         return {
             "display_price": price_safe,