diff --git a/corepos/db/office_op/model.py b/corepos/db/office_op/model.py
index 5e9a34a..16bbc57 100644
--- a/corepos/db/office_op/model.py
+++ b/corepos/db/office_op/model.py
@@ -80,7 +80,9 @@ class TableSyncRule(Base):
     """
     __tablename__ = 'TableSyncRules'
 
-    id = sa.Column('tableSyncRuleID', sa.Integer(), nullable=False, primary_key=True, autoincrement=True)
+    # nb. this should be autoincrement, but we can't do that
+    # automatically via sqlalchemy when PK is composite
+    id = sa.Column('tableSyncRuleID', sa.Integer(), nullable=False, primary_key=True)
 
     table_name = sa.Column('tableName', sa.String(length=255), nullable=False, primary_key=True)
 
@@ -1617,8 +1619,11 @@ class CustomReceiptLine(Base):
     """
     __tablename__ = 'customReceipt'
 
-    sequence = sa.Column('seq', sa.Integer(), primary_key=True, autoincrement=True, nullable=False)
-    type = sa.Column(sa.String(length=20), primary_key=True, autoincrement=False, nullable=False)
+    # nb. this should be autoincrement, but we can't do that
+    # automatically via sqlalchemy when PK is composite
+    sequence = sa.Column('seq', sa.Integer(), primary_key=True, nullable=False)
+
+    type = sa.Column(sa.String(length=20), primary_key=True, nullable=False)
     text = sa.Column(sa.String(length=80), nullable=True)
 
     def __str__(self):