diff --git a/models/intermediate/core/schema.yaml b/models/intermediate/core/schema.yaml
index 241a528..c9b891b 100644
--- a/models/intermediate/core/schema.yaml
+++ b/models/intermediate/core/schema.yaml
@@ -1721,13 +1721,14 @@ models:
           - PMS
           - OSL
           - API/MANUAL
+          - null (bookings without verification request)
         tests:
-          - not_null
           - accepted_values:
                 values:
                   - 'PMS'
                   - 'OSL'
                   - 'API/MANUAL'
+                  - null
 
       - name: id_staging_host_booking
         data_type: bigint