diff --git a/ereuse_devicehub/resources/proof/models.py b/ereuse_devicehub/resources/proof/models.py
index fb1f676c..07739ecb 100644
--- a/ereuse_devicehub/resources/proof/models.py
+++ b/ereuse_devicehub/resources/proof/models.py
@@ -88,7 +88,7 @@ class ProofDevice(db.Model):
 
 
 class ProofTransfer(JoinedTableMixin, Proof):
-    transfer_id = Column(UUID, ForeignKey(Trade.id), nullable=False)
+    transfer_id = Column(UUID(as_uuid=True), ForeignKey(Trade.id), nullable=False)
     transfer = relationship(DisposeProduct,
                             backref=backref("proof_transfer",
                                             lazy=True,
diff --git a/ereuse_devicehub/resources/proof/schemas.py b/ereuse_devicehub/resources/proof/schemas.py
index bc9143bc..1751dc20 100644
--- a/ereuse_devicehub/resources/proof/schemas.py
+++ b/ereuse_devicehub/resources/proof/schemas.py
@@ -32,6 +32,7 @@ class ProofTransfer(Proof):
     __doc__ = m.ProofTransfer.__doc__
     transfer = NestedOn(s_action.DisposeProduct,
                         required=True,
+                        data_key='transferID',
                         only_query='id')