Alastair,
Why do you keep uploading new upstream releases which trigger transition
due to bumped SONAMEs to unstable, and thereby triggering uncoordinated
transitions?
When SONAMEs are bumped and library packages renamed the package should
be uploaded to experimental and the transition coordinated with the
Release Team.
Please read the documentation and stick to that process:
https://wiki.debian.org/Teams/ReleaseTeam/Transitions
I'm very disappointed that you still haven't learned to coordinate
transition with the Release Team, especially since your uncoordinated
libdap transition conflicts with the ongoing gdal-2.2.1 transition.
You need to contact the Release Team by filing the transition bugreport
for libdap to coordinate the transition.
Kind Regards,
Bas