Promos: MDOT Rate?

We had guest to book on October. They show to have received a discount. In the notes is shows a "Promos: MDOT Rate" Can you tell me what this is? Did we sign up for this? 

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Sharonpowney 2 years ago

You have posted this on the partner forum so we are not able to look at settings on your property.  You should email booking.com help team using the Inbox icon on Extranet.