Administrators can remove Relationships of any type from the Dynamic Evidence Type Version. Note that it is not valid to remove a Relationships if the Dynamic Evidence Type in question has an Active Version with this relationship present (the Editor will allow it, but this will fail Activation for the modified Dynamic Evidence Type Version).
This is achieved by clicking the 'x' button which appears in the top left-hand corner of the Mandatory or Optional Parent class on the Model Canvas. Deleting a Relationship will remove the class and its line to the Dynamic Evidence Type Version class from the Model Canvas, trigger all other Relationship classes to reposition themselves on the Model Canvas, and if the last Relationship was deleted, trigger the Dynamic Evidence Type Version class to reposition itself.