Editing imagery offset database in JOSM

Is there a way to re-edit an offset value that I have just uploaded?

Oh, and another bug maybe. I can only upload one imagery offset to the database during a JOSM session. For example, if I uploaded an offset for Maxar P, any attempt to upload offset for Bing or Esri imagery will result in error (something like) " The offset value is already in the database". Restarting JOSM will fix that issue.