Workflow Attachment transaction execution

I am supporting a custom business object developed around a custom transaction designed to maintain a group of custom tables. When a work item for this object is routed to an inbox, the attachment only displays the object key in a pop-up rather than calling the transaction. I am assuming that this is because the display method in the workflow calls function ‘SWO_DIALOG_OBJECT_KEY_EDIT’ which only creates a popup box with the object key, rather than doing a call transaction like the display method does for BUS2009. I can’t change my method because it is shown as inherited. Is there a way I can “un-inherit” a method so that I can change it? Or is there some other way I can use to call my custom transaction by clicking the attachment in the work item?