diff --git a/modules/purchase_trade/purchase.py b/modules/purchase_trade/purchase.py
index be305ba..2d09ed0 100755
--- a/modules/purchase_trade/purchase.py
+++ b/modules/purchase_trade/purchase.py
@@ -529,6 +529,138 @@ class PriceComposition(ModelSQL,ModelView):
     component = fields.Char("Component")
     price = fields.Numeric("Price")
 
+class AssayImporter:
+
+    def __init__(self):
+        pool = Pool()
+        self.AssayLine = pool.get('assay.line')
+        self.Element = pool.get('assay.element')
+        self.Uom = pool.get('product.uom')
+
+    # -----------------------------
+    # PUBLIC ENTRYPOINT
+    # -----------------------------
+    def import_from_json(self, data: dict, assay):
+        self._update_assay(data,assay)
+        lines = self._create_lines(data, assay)
+
+        self.AssayLine.save(lines)
+        return assay
+
+    # -----------------------------
+    # HEADER
+    # -----------------------------
+    def _update_assay(self, data):
+        Party = Pool().get('party.party')
+        metadata = data.get('document_metadata', {})
+
+        assay = self.Assay()
+
+        assay.reference = metadata.get('report_reference')
+        assay.date = self._parse_date(metadata.get('issue_date'))
+        assay.type = self._map_type(metadata.get('status'))
+        assay.status = 'draft'
+        assay.lab = Party.getPartyByName(metadata.get('lab_name'))
+
+        assay.save()
+        return assay
+
+    # -----------------------------
+    # LINES
+    # -----------------------------
+    def _create_lines(self, data, assay):
+        lines = []
+
+        # assays
+        for item in data.get('assays', []):
+            lines.append(self._build_line(item, assay, category='assay'))
+
+        # penalties
+        for item in data.get('penalties', []):
+            lines.append(self._build_line(item, assay, category='penalty'))
+
+        # moisture
+        moisture = data.get('weights_and_moisture', {}).get('moisture')
+        if moisture and moisture.get('value') is not None:
+            lines.append(self._build_line({
+                "element": "H2O",
+                "value": moisture.get('value'),
+                "unit": moisture.get('unit')
+            }, assay, category='moisture'))
+
+        return lines
+
+    # -----------------------------
+    # LINE BUILDER
+    # -----------------------------
+    def _build_line(self, item, assay, category):
+        line = self.AssayLine()
+
+        line.assay = assay
+        line.element = self._get_or_create_element(item.get('element'))
+        line.value = self._safe_float(item.get('value'))
+        line.unit = self._get_uom(item.get('unit'))
+        line.category = category
+
+        line.method = item.get('method')
+        line.is_payable = item.get('is_payable', False)
+
+        return line
+
+    # -----------------------------
+    # HELPERS
+    # -----------------------------
+    def _get_or_create_element(self, code):
+        if not code:
+            return None
+
+        elements = self.Element.search([('name', '=', code)])
+        if elements:
+            return elements[0]
+
+        # auto-create (optionnel mais pratique)
+        element = self.Element()
+        element.name = code
+        element.save()
+        return element
+
+    def _get_uom(self, unit_name):
+        if not unit_name:
+            return None
+
+        uoms = self.Uom.search([('symbol', '=', unit_name)])
+        if uoms:
+            return uoms[0]
+
+        return None  # ou lever une erreur selon ton besoin
+
+    def _parse_date(self, date_str):
+        if not date_str:
+            return None
+        try:
+            return datetime.datetime.strptime(date_str, "%Y-%m-%d").date()
+        except Exception:
+            return None
+
+    def _safe_float(self, value):
+        try:
+            return float(value)
+        except Exception:
+            return None
+
+    def _map_type(self, status):
+        if not status:
+            return 'provisional'
+
+        status = status.lower()
+
+        if 'final' in status:
+            return 'final'
+        if 'umpire' in status:
+            return 'umpire'
+
+        return 'provisional'
+    
 class Assay(ModelSQL, ModelView):
     "Assay"
     __name__ = 'assay.assay'
@@ -549,7 +681,7 @@ class Assay(ModelSQL, ModelView):
         ('validated', 'Validated'),
     ], "Status")
 
-    laboratory = fields.Char("Laboratory")
+    lab = fields.Many2One('party.party',"Laboratory")
 
     lines = fields.One2Many(
         'assay.line', 'assay', "Assay Lines"
@@ -973,7 +1105,15 @@ class Line(metaclass=PoolMeta):
                     f = Fee(line.fee_)
                     f.purchase = line.purchase
                     Fee.save([f])
-                
+            
+            if line.assays:
+                for assay in line.assays:
+                    if not assay.lines and assay.document:
+                        data = json.load(f)
+                        importer = AssayImporter()
+                        importer.import_from_json(data,assay)
+                        logger.info("Updated assay:%s", assay.id)
+
     def check_from_to(self,tr):
         if tr.pricing_period:
             date_from,date_to, d, include, dates = tr.getDateWithEstTrigger(1)
diff --git a/modules/purchase_trade/view/assay_form.xml b/modules/purchase_trade/view/assay_form.xml
index f9f763f..0208528 100644
--- a/modules/purchase_trade/view/assay_form.xml
+++ b/modules/purchase_trade/view/assay_form.xml
@@ -7,8 +7,8 @@
     <field name="type"/>
     <label name="status"/>
     <field name="status"/>
-    <label name="laboratory"/>
-    <field name="laboratory"/>
+    <label name="lab"/>
+    <field name="lab"/>
     <label name="filename"/>
     <field name="filename"/>
     <newline/>
diff --git a/modules/purchase_trade/view/assay_tree.xml b/modules/purchase_trade/view/assay_tree.xml
index 621c570..df9b59b 100644
--- a/modules/purchase_trade/view/assay_tree.xml
+++ b/modules/purchase_trade/view/assay_tree.xml
@@ -3,6 +3,6 @@
     <field name="date"/>
     <field name="type"/>
     <field name="status"/>
-    <field name="laboratory"/>
+    <field name="lab"/>
     <field name="document"/>
 </tree>
\ No newline at end of file