undoremap ('<application-name>', '<dialog name>')
Please not that the <application-name> should be same as the one given as the commmand-line argument for appmap generation.
Refer: http://webcvs.freedesktop.org/ldtp/ldtp/src/remap.c
remap ('dlggeditPreferences', 'ptabView') # Remaps all the controls under page tab with the name View of gedit Preferences dialog.
. .
undoremap ('evolution', 'dlgAppointment-Nosummary')