Report Filter issue

I have created a report between two objects, Both objects are related to each other  I have an assignment object where one  field is called Role And 

one object resource object where one field is called Resource role   I need to add that filter that shows these both roles are not equal to each other. Like IF the assignment role is the manager and the resource role is a manager doesn't want to see those data but if assignment role and resource role is different only report should be shown those data.