You can only update IDs which you see when you click on "Get Codes".
You have added a number which is not a valid Expedia rate id into the field in the "Channels" tab of a rate/daily price.
*Go to Prices > Channel Mapping enter the Rate id in the Search box and click on the Rate and make sure the correct booking.com rate id is selected from the 'get codes' list.
*Scroll to Rate id and click 'get codes' ensure you select a valid code from the list.
*Open your rates (Channel Tab) and make sure the correct Expedia rate id is selected from the 'get codes' list.