Add to first paragraph of section 13.1:
Function import, entity set, and association set names MUST be unique within an entity container.
https://www.oasis-open.org/apps/org/workgroup/odata/download.php/46811/odata-csdl-v1.0-wd01-2012-09-03-RH.doc
Accepted: https://www.oasis-open.org/committees/download.php/46845/odata_meeting-6_on-20120906_minutes.html