Remove duplicates rows


I would like help in the following case:

I have a table with process numbers referring to messages sent to our customers.
But sometimes, these messages are sent to the customer and to our company (Accounting Office).
I would like to remove the case number line referring to our office when the table has the same case number for the client and the office.

Below I put an image of the table to help understanding.

Hi @robot.gestus