diff --git a/modules/purchase_trade/docs/business/invariants.md b/modules/purchase_trade/docs/business/invariants.md
index c7c0480..0c4aff7 100644
--- a/modules/purchase_trade/docs/business/invariants.md
+++ b/modules/purchase_trade/docs/business/invariants.md
@@ -43,7 +43,9 @@ executer.
 </li>
 <li style="margin:0.38rem 0;">Regle de conservation: <code>sum(lots physiques) + lot virtuel = quantity_theorical</code>.
 </li>
-<li style="margin:0.38rem 0;">Regle du forecast ouvert: <code>sum(lot.qt non zero) = max(lot virtuel, 0)</code>.
+<li style="margin:0.38rem 0;">Regle du forecast ouvert minimal: <code>sum(lot.qt non zero) &gt;= max(lot virtuel, 0)</code>.
+</li>
+<li style="margin:0.38rem 0;">Un surplus de forecast ouvert est accepte apres surconsommation physique: <code>lot.qt</code> s&#x27;arrete a zero, alors que le lot virtuel absorbe toute la quantite physique.
 </li>
 <li style="margin:0.38rem 0;">Les lignes <code>lot.qt</code> a zero sont ignorees par les checks: elles peuvent servir de memoire d&#x27;une prevision consommee.
 </li>
diff --git a/modules/purchase_trade/docs/business/sql/README.md b/modules/purchase_trade/docs/business/sql/README.md
index 4abfe1d..4b901e9 100644
--- a/modules/purchase_trade/docs/business/sql/README.md
+++ b/modules/purchase_trade/docs/business/sql/README.md
@@ -89,6 +89,11 @@ For every other fee, it recomputes the expected quantity from the effective
 </li>
 </ul>
 
+The diagnostic is grouped by `fee_id`. Purchase and sale columns are displayed
+only to help identify related contracts; they do not split the expected
+quantity. This matters for purchase fees whose linked lots may also be matched
+to several sale lines.
+
 Run it on a restored test database:
 
 <pre style="background:#263238; color:#eef7ff; padding:1rem; border-radius:0.35rem; overflow:auto;"><code>\i modules/purchase_trade/docs/business/sql/fee_quantity_consistency_checks.sql</code></pre>
diff --git a/modules/purchase_trade/docs/business/sql/fee_quantity_consistency_checks.sql b/modules/purchase_trade/docs/business/sql/fee_quantity_consistency_checks.sql
index 65e8a46..a2953e4 100644
--- a/modules/purchase_trade/docs/business/sql/fee_quantity_consistency_checks.sql
+++ b/modules/purchase_trade/docs/business/sql/fee_quantity_consistency_checks.sql
@@ -4,6 +4,9 @@ Read-only diagnostic for fee quantity consistency.
 Business rule:
   For every fee except Per packing, fee.quantity must equal the sum of the
   applicable net/gross quantities of its effective lots.
+  The diagnostic is grouped by fee_id. Purchase/sale references are only
+  displayed to help identify the contracts involved; they must not split the
+  expected quantity.
 
 Effective lots:
   - physical lots if at least one physical lot is linked to the fee;
@@ -149,10 +152,20 @@ computed_fees AS (
         fee_id,
         mode,
         fee_quantity,
-        purchase_id,
-        purchase_number,
-        sale_id,
-        sale_number,
+        CASE
+            WHEN count(DISTINCT purchase_id) FILTER (WHERE purchase_id IS NOT NULL) = 1
+                THEN min(purchase_id)
+            ELSE NULL
+        END AS purchase_id,
+        string_agg(DISTINCT purchase_number, ', ')
+            FILTER (WHERE purchase_number IS NOT NULL) AS purchase_number,
+        CASE
+            WHEN count(DISTINCT sale_id) FILTER (WHERE sale_id IS NOT NULL) = 1
+                THEN min(sale_id)
+            ELSE NULL
+        END AS sale_id,
+        string_agg(DISTINCT sale_number, ', ')
+            FILTER (WHERE sale_number IS NOT NULL) AS sale_number,
         bool_or(selected_qt_state IS NULL) AS has_missing_state,
         bool_or(
             lot_unit_category IS NULL
@@ -163,8 +176,7 @@ computed_fees AS (
         round(sum(computed_quantity)::numeric, 5) AS expected_quantity
     FROM computed_lot_quantities
     GROUP BY
-        fee_id, mode, fee_quantity,
-        purchase_id, purchase_number, sale_id, sale_number
+        fee_id, mode, fee_quantity
 )
 SELECT
     'fee_quantity_mismatch' AS check_name,
diff --git a/modules/purchase_trade/docs_source/business/invariants.md b/modules/purchase_trade/docs_source/business/invariants.md
index a38144a..a041652 100644
--- a/modules/purchase_trade/docs_source/business/invariants.md
+++ b/modules/purchase_trade/docs_source/business/invariants.md
@@ -36,8 +36,11 @@ executer.
   existants et des `lot.qt` deja matches ou shippes.
 - Regle de conservation:
   `sum(lots physiques) + lot virtuel = quantity_theorical`.
-- Regle du forecast ouvert:
-  `sum(lot.qt non zero) = max(lot virtuel, 0)`.
+- Regle du forecast ouvert minimal:
+  `sum(lot.qt non zero) >= max(lot virtuel, 0)`.
+- Un surplus de forecast ouvert est accepte apres surconsommation physique:
+  `lot.qt` s'arrete a zero, alors que le lot virtuel absorbe toute la quantite
+  physique.
 - Les lignes `lot.qt` a zero sont ignorees par les checks: elles peuvent servir
   de memoire d'une prevision consommee.
 - Le check applicatif est centralise dans
diff --git a/modules/purchase_trade/docs_source/business/sql/README.md b/modules/purchase_trade/docs_source/business/sql/README.md
index b11061a..19645b1 100644
--- a/modules/purchase_trade/docs_source/business/sql/README.md
+++ b/modules/purchase_trade/docs_source/business/sql/README.md
@@ -71,6 +71,11 @@ For every other fee, it recomputes the expected quantity from the effective
 - `lot.qt.hist.quantity` for net fees and `lot.qt.hist.gross_quantity` for gross
   fees.
 
+The diagnostic is grouped by `fee_id`. Purchase and sale columns are displayed
+only to help identify related contracts; they do not split the expected
+quantity. This matters for purchase fees whose linked lots may also be matched
+to several sale lines.
+
 Run it on a restored test database:
 
 ```sql