When availability updates are failing, the ADS message logs are checked in order to resolve these errors. In order to resolve the errors found on the ADS message logs the below steps need to be followed:

1. ADS Message Logs
- To access the messages navigate to Tools -> System Administration -> Interfaces -> ADS -> View ADS Message Logs.
- Select the drop downs specific to the OTA (in this scenario Booking.com) and the Property, then select the eRes Type and click on the "Search" button.
- The search will return the latest inventory or rate messages last uploaded to the OTA's. The "Sent" message contains what has been sent to the OTA's, whereas the "Received" message contains success or error messages.
- In order to view these messages highlight the message by clicking on it and click on the "View" button, thereafter click on the "Pretty Print" button in the bottom right-hand corner.
- Please see the below examples of frequent errors received.

1.1 Error Type=3 Code=402 RatePlanCode not active for InvTypeCode
<Errors> <Error Type="3" Code="402" Status="NotProcessed" ShortText="RatePlanCode '937165' not active for InvTypeCode '1516503'" /> </Errors>
- This error is caused by the specific Rate Code not being linked to the Room Type specified on the Booking.com extranet.
- Usually this Rate Code is mapped in eRes and sending rates to Booking.com, but Booking.com is rejecting the update as there is no link for the Room Type-> Rate Code combination in Booking.com.
- The user can decide to either remove the Rate mapping in eRes (should the rate not need to be mapped as its is no longer valid) or to link the Room Type to the Rate in Booking.com.

1.2 Error Type=1 Code=367 Not allowed to update Single Use Rate for Room
<Error Type="1" Code="367" Status="NotProcessed" ShortText="Not allowed to update Single Use Rate for Room 'Triple Room' (4849084021) because Single Use Rate 'Standard Rate' (14209408) is not activated for this Room, please contact Bookings to activate this Rate Category" /
- This error refers to a setting that needs to be changed on the Booking.com extranet to allow for Single Use Rates (or single occupancy rates for the room), as this is not supported for the current Room configuration.