Why can I not allocate a room number to my reservation in Apex?

Why can I not allocate a room number to my reservation in Apex?

In order to allocate a room number to a reservation in Apex please follow the below steps:

1.  Have you checked the Room Chart?
  1. Navigate to the Room Chart by either using the icon on the Speed Bar or selecting Processing -> Reception -> Room Chart. Please ensure that the specific room you need to assign is not already allocated to another reservation by looking at the "Allocated rooms" section. 
  1. Alternatively ensure that the room you need to allocated is not already booked and under the un-allocated screen section.
2. Is the reservation part of a Group Reservation?
  1. Should the reservation be part of a Group Reservation you will need to do a "Pick-up", whereby the room list is completed, first before rooms can be blocked or allocated.