US4219 some code tidy up and added a log message when the assign fulfil succeeded and corrected the log message when it failed
US4219 some code tidy up and added a log message when the assign fulfil succeeded and corrected the log message when it failed

dvla/vrm-assign-online,dvla/vrm-assign-online,dvla/vrm-assign-online,dvla/vrm-assign-online