Delete action in Cell action map for references to the applicable concept

Hi everyone,

I am creating a very basic graphical language in MPS, and I have run into an issue when trying to delete a connection/connector from the diagram. I have created a "cell action map" with a "delete action" for the concept that is drawn as a connector. I have succesfully deleted the node itself (and its connector representation) by using the delete action. The problem is that I also want to delete some references that are pointing to the deleted node from the "delete action" of the node under subject. I can programmatically access all these references to the deleted node and I am trying to delete/remove them. This somehow seems not to be working. Is there a restriction (maybe something to do with access permission from the cell action map) impeding me to do that? Is it possible to do this differently? Has anyone ever run into the same problem?