diff --git a/corepos/db/office_op/model.py b/corepos/db/office_op/model.py
index 400c4a6..3684d39 100644
--- a/corepos/db/office_op/model.py
+++ b/corepos/db/office_op/model.py
@@ -907,6 +907,9 @@ class CustData(Base):
     https://github.com/CORE-POS/IS4C/blob/master/fannie/classlib2.0/data/models/op/CustdataModel.php
     """
     __tablename__ = 'custdata'
+    __table_args__ = (
+        sa.ForeignKeyConstraint(['memType'], ['memtype.memtype']),
+    )
 
     id = sa.Column(sa.Integer(), primary_key=True, autoincrement=True, nullable=False)