diff --git a/ereuse_devicehub/resources/proof/models.py b/ereuse_devicehub/resources/proof/models.py
index ed8bd798..2562b446 100644
--- a/ereuse_devicehub/resources/proof/models.py
+++ b/ereuse_devicehub/resources/proof/models.py
@@ -137,12 +137,14 @@ class ProofReuse(JoinedTableMixin, Proof):
     id_receipt = Column(CIText(), default='', nullable=False)
     supplier_id = db.Column(UUID(as_uuid=True),
                          db.ForeignKey(User.id),
-                         nullable=False,
-                         default=lambda: g.user.id)
+                         # nullable=False,
+                         # default=lambda: g.user.id)
+                         nullable=True)
     supplier = db.relationship(User, primaryjoin=lambda: ProofReuse.supplier_id == User.id)
     receiver_id = db.Column(UUID(as_uuid=True),
                          db.ForeignKey(User.id),
-                         nullable=False)
+                         # nullable=False)
+                         nullable=True)
     receiver = db.relationship(User, primaryjoin=lambda: ProofReuse.receiver_id == User.id)
     price = Column(db.Integer)
 
diff --git a/ereuse_devicehub/resources/proof/schemas.py b/ereuse_devicehub/resources/proof/schemas.py
index a07fc524..de18a41f 100644
--- a/ereuse_devicehub/resources/proof/schemas.py
+++ b/ereuse_devicehub/resources/proof/schemas.py
@@ -57,8 +57,8 @@ class ProofReuse(Proof):
     __doc__ = m.ProofReuse.__doc__
     receiver_segment = String(default='', data_key='receiverSegment', required=True)
     id_receipt = String(default='', data_key='idReceipt', required=True)
-    supplier_id = UUID(load_only=True, required=True, data_key='supplierID')
-    receiver_id = UUID(load_only=True, required=True, data_key='receiverID')
+    supplier_id = UUID(load_only=True, required=False, data_key='supplierID')
+    receiver_id = UUID(load_only=True, required=False, data_key='receiverID')
     price = Integer(required=True)