It usually means the room or rate type in your channel manager has not been linked to a booking channel listing yet. In practice, that leaves the item “unmapped,” so updates like availability, rates, or restrictions may not sync properly to the channel.

What it means

  • 50RC is likely an internal room/rate code used by your property system or channel manager.
  • Not mapped to booking channel means that code has not been matched to the corresponding room or rate on Booking.com or another booking channel.
  • When mapping is missing, the channel manager may not be able to control that inventory correctly, which can cause sync errors or overbooking risk.

What to do

  1. Open your channel manager’s channel setup or mapping page.
  2. Find the room or rate labeled 50RC.
  3. Link it to the correct Booking channel room/rate.
  4. Save the mapping and run a refresh or sync check if your system offers it.

Common causes

  • The room/rate was created in the PMS but never mapped.
  • The Booking channel added a new room type that still needs linking.
  • The mapping was broken after a channel or rate setup change.

Practical example

If your system has a room code called 50RC Deluxe Double , but Booking.com only knows that listing as Deluxe Double Room , the two must be matched manually in the channel mapping screen. Until that happens, the system treats it as unmapped and may not update it correctly.

TL;DR

“50RC not mapped to booking channel” means that room/rate code is not connected to the Booking channel listing yet , so synchronization may not work until you map it.