diff --git a/apps/edr-passenger-api/prisma/schema.prisma b/apps/edr-passenger-api/prisma/schema.prisma
index b58356365..db46df025 100644
--- a/apps/edr-passenger-api/prisma/schema.prisma
+++ b/apps/edr-passenger-api/prisma/schema.prisma
@@ -580,7 +580,7 @@ model BookingSeat {
   bookingId         String
   seatId            String
   leg               Int               @default(1) // 1=outbound/leg-1, 2=return/leg-2
-  scheduleId        String            // which schedule this seat belongs to
+  scheduleId        String?            // which schedule this seat belongs to
   passengerName     String
   dateOfBirth       DateTime?
   passengerCategory PassengerCategory @default(ADULT)