diff --git a/app/modules/cdr/cruds_cdr.py b/app/modules/cdr/cruds_cdr.py
index a4b6e7b89d..38cf2cc557 100644
--- a/app/modules/cdr/cruds_cdr.py
+++ b/app/modules/cdr/cruds_cdr.py
@@ -484,12 +484,16 @@ async def get_purchases_by_ids(
     db: AsyncSession,
     user_id: str,
     product_variant_id: list[UUID],
+    validated: bool | None = None,
 ) -> Sequence[models_cdr.Purchase]:
+    constraints = [
+        models_cdr.Purchase.user_id == user_id,
+        models_cdr.Purchase.product_variant_id.in_(product_variant_id),
+    ]
+    if validated is not None:
+        constraints.append(models_cdr.Purchase.validated == validated)
     result = await db.execute(
-        select(models_cdr.Purchase).where(
-            models_cdr.Purchase.user_id == user_id,
-            models_cdr.Purchase.product_variant_id.in_(product_variant_id),
-        ),
+        select(models_cdr.Purchase).where(*constraints),
     )
     return result.scalars().all()
 
diff --git a/app/modules/cdr/endpoints_cdr.py b/app/modules/cdr/endpoints_cdr.py
index 0bf21a9920..ee067f7fba 100644
--- a/app/modules/cdr/endpoints_cdr.py
+++ b/app/modules/cdr/endpoints_cdr.py
@@ -1964,12 +1964,17 @@ async def mark_purchase_as_validated(
             minimal_end_date=date(datetime.now(UTC).year, 9, 5),
         )
         for product_constraint in product.product_constraints:
+            # When we validate a product, we want to check for already existing memberships
+            # If someone purchase a product that gives the required membership, this product must be validated first.
             purchases = await cruds_cdr.get_purchases_by_ids(
                 db=db,
                 user_id=user_id,
                 product_variant_id=[
                     variant.id for variant in product_constraint.variants
                 ],
+                # In case we want to allow validating products
+                # considering non-validated purchases we may remove this additional filter
+                validated=True,
             )
             if not purchases:
                 if product_constraint.related_membership: