'''room/rate combination is not active'''
Your codes are not correctly mapped. Check you have entered the right Booking.com mapping codes.
You have added a number which is not a valid Booking.com rate id into the field in the "Channels" tab of a rate/daily price.
*Open your rates (Channel Tab) and make sure the correct booking.com rate id is selected from the 'get codes' list.
*Open your daily prices (Enable list) and make sure the correct booking.com rate id is selected from the 'get codes' list.
'''Not allowed to update Single Use Rate for Room'''