Business partner 1000000168 does not exist in the standard role for role cat. MKK

After entering the BP in a sales order, I am getting the above error.

1. I have not entered any data for the BP for role MKK- Contract Partner.

2. I want a BP without the mentioned role(MKK partner role).

However this seems like a mandatory partner role, so that I am not able to create an order.

Where do we exactly have a configuration for this? Can anyone guide me on this? How to resolve this issue?