diff --git a/backend/app/routers/id_token_v1.py b/backend/app/routers/id_token_v1.py
index 2b89c73..2162aeb 100644
--- a/backend/app/routers/id_token_v1.py
+++ b/backend/app/routers/id_token_v1.py
@@ -42,7 +42,7 @@ async def get_id_token(
     id_token = result.scalars().first()
     if id_token == None:
         raise HTTPException(status_code=404, detail="IdToken not found")
-    if token.role != Role.ADMINISTRATOR & id_token.owner_id != token.subject:
+    if token.role != Role.ADMINISTRATOR and id_token.owner_id != token.subject:
         raise HTTPException(status_code=404, detail="IdToken not found")
     return id_token
 
diff --git a/backend/app/routers/transaction_v1.py b/backend/app/routers/transaction_v1.py
index 4c6feb2..d6139f5 100644
--- a/backend/app/routers/transaction_v1.py
+++ b/backend/app/routers/transaction_v1.py
@@ -44,7 +44,7 @@ async def get_transaction(
     transaction = result.scalars().first()
     if transaction == None:
         raise HTTPException(404, "Transaction not found")
-    if token.role != Role.ADMINISTRATOR & transaction.user_id != token.subject:
+    if token.role != Role.ADMINISTRATOR and transaction.user_id != token.subject:
         raise HTTPException(404, "Transaction not found")
     return transaction
 
@@ -59,7 +59,7 @@ async def get_transaction_meter_values(
     transaction = result.scalars().first()
     if transaction == None:
         raise HTTPException(404, "Transaction not found")
-    if token.role != Role.ADMINISTRATOR & transaction.user_id != token.subject:
+    if token.role != Role.ADMINISTRATOR and transaction.user_id != token.subject:
         raise HTTPException(404, "Transaction not found")
     stmt = select(DbMeterValue).where(DbMeterValue.transaction_id == transaction_id).order_by(DbMeterValue.timestamp)
     result = db.execute(stmt)
@@ -76,7 +76,7 @@ async def remote_stop_transaction(
     transaction = result.scalars().first()
     if transaction == None:
         raise HTTPException(404, "Transaction not found")
-    if token.role != Role.ADMINISTRATOR & transaction.user_id != token.subject:
+    if token.role != Role.ADMINISTRATOR and transaction.user_id != token.subject:
         raise HTTPException(404, "Transaction not found")
     if transaction.status != TransactionStatus.ONGOING:
         raise HTTPException(status_code=422, detail=[{