diff --git a/corepos/db/office_op/model.py b/corepos/db/office_op/model.py
index 8590375..12688af 100644
--- a/corepos/db/office_op/model.py
+++ b/corepos/db/office_op/model.py
@@ -169,6 +169,25 @@ class Store(Base):
         return self.description or ""
 
 
+class MasterSuperDepartment(Base):
+    """
+    A department may belong to more than one superdepartment, but has
+    one "master" superdepartment.  This avoids duplicating rows in
+    some reports.  By convention, a department's "master"
+    superdepartment is the one with the lowest superID.
+    """
+    __tablename__ = 'MasterSuperDepts'
+
+    super_id = sa.Column('superID', sa.Integer(), primary_key=True, autoincrement=False, nullable=False)
+
+    department_id = sa.Column('dept_ID', sa.Integer(), primary_key=True, autoincrement=False, nullable=False)
+
+    super_name = sa.Column(sa.String(length=50), nullable=True)
+
+    def __str__(self):
+        return self.super_name or ""
+
+
 class SuperDepartment(Base):
     """
     Represents a "super" (parent/child) department mapping.