[...] MUST be located at the URI http://ServiceRoot/$batch.
The ServiceRoot was missing, but referred to in the next sentence
Applied in https://www.oasis-open.org/apps/org/workgroup/odata/download.php/46767/odata-batch-processing-v1.0-wd01-2012-08-24-RH.doc
Accepted: https://www.oasis-open.org/committees/download.php/46979/odata_meeting-5_on-20120830_minutes.html